First Welcome!
Second, be careful. You often get quick answers in the forums. That may be fine for 75%->90% of the people. But, what if you're not one of the 75%->90%? In your case, you are
not! Not by a long shot!
There are a
number of issues before
any suspension mod is done to a Stang. So, can you put Bullitt springs on your Stang? Sure. Heck, you could even put the POS B springs on your vert Stang. Putting B springs on a vert (and keeping them on) is just plain stupid. But, I'm sure if you search long enough, you'll find people that have done, have it currently, and would even *recommend* it. The point again is to be very careful! FWIW: I don't _think_ anyone on either this forum or the corral has that type of setup.
Now, the most important thing of all is
why do you want to change the springs at all on your car? I mean the exact reason(s), and in order.
Next, do you have an AOD (Auto), or T5 (5-spd).
Do you have sub-frames?
CC plates, STB, bump-steer kit?
WHAT TIRES AND WHEELS?
Do you have the death-wish worthless POS stock brakes on the car?
ANY other mods (alum heads, 3-core radiator, sn95 brakes, fuzzy dice

).
Bla, bla, bla.
For a Fox, you always want to use Fox struts. The sn95 struts are too long and have less bump travel. But, people, like me

, do use sn95 struts for different reasons. One is that you can get the Bullitt struts in a package. But, IMHO, they are a bad choice for a Stang that's lowered too much. I use sn95 struts because my car isn't lowered much and I want to be able to change the ABS sensors without removing the strut. I have the 98 Cobra ABS system on my car.
There are a *number* of factors that effect how much a
particular car will be lowered by set of springs.
You have an '86. You have pure cr*p for camber adjustment. Even with CC plates! But, some people want their "ground scraping" cars regardless of how much it screws up the handling or performance of the car (or even having positive camber all of the time!). Again, it's all want
you want! It's not about what I want or what others want. You can get suggestions. But, unless you say
exactly what you want, you'll get a lot of different views.
I'll tell you the right way (from an
engineering point of view) on how to do a suspension mod. And what should be done if you want a
street handling/performance setup. Track, OT/CT/Qtr mile, all have their own requirements. But, it's not cheap. But, it's also
not that expensive! It is more than just slapping some springs on the car and calling it a day.
At the very least,
you will
need sub-frames and an STB for a vert! Then, with an 86 you
need CC plates (get MM!) if the car is lowered at all! A bump-steer kit is a very good idea, and I highly suggest it. But, it's not "100% needed". If you have an auto vert, you can't use just the Bullitt springs without getting into (IMHO) "ricer" territory (you'd have *poorer* handling & performance, and a very real risk of the strut bottoming out). But, for ~$50, you could add on the Steeda spring spacers and get close to ~3/4" drop on a vert with an AOD.
Like I said, there are *many* issues involved. There's are differences between "can I do it", "will it help performance", "will it hurt performance", "will it not make much difference", etc.
FWIW: Here is my set up:
http://www.veryuseful.com/mustang/tech/misc/Mustang1986_with_Mach1_springs/
*I* can not have a car that's lowered too much. I have an *86* with the sn95 Cobra brakes, D178 rims, "wide" 245/45/17 RE720 tires (wider than a typical 245), and 1/4" wheel spacer up front. Also, for an *86*, I still had to do custom brackets for the caliper hoses because of wheel rubbing (even with the wheel spacer). I also have an AOD. Oh yea, and I still don't have nearly enough camber for my desires. Argg! But, I'm at least back to stock.
Like I said, there's the "75%-90%", and then there are the rest of us. The 92/93 Stangs have it the best in terms of mods. Other than that, each group of years have their own concerns and limitations. The 85/86's have the most limitations and concerns. But, that doesn't mean that stuff can't be done. It just means that it has to be done with more research.
Also, when ever asking a tech question, make *sure* you say that you have an '86 vert! 
Like you did in this thread. Otherwise, it's mostly assumed that you have a 90's hatch 5-spd Fox.
Last: Putting on a foolish mod (like I did when I put the POS B springs on my car), realizing that it's a foolish mod, and then changing it is not stupid - it's called learning! Nothing is wrong with learning! But, be careful in doing a mod, seeing that it's not good, and just keeping it because "others have". People do bad mods all of the time! In the end,
you are the one that's responsible for your car, it's safety, it ride & performance, and so on. That's one of the best things about owning a Fox, there are tons of mods that you can do!
Four Eyes RULE!