Some of the non Mustang intakes (that are of the Mustang/non-gt40 design) had shorter runners and that reduced the torque output. The Mustang intake flowed as good as any other, that why they used that intake on the HO engine.
At this point in time it's hard to tell who may have done what to your T-bird. As an example I was all set to order and install a steel throwout bearing retainer on my car only to find out that someone has already done it. My car had 60k miles when I got it and that was literally the only non-stock part on the entire car. Apparently there was a clutch/tranny problem at one time and the part was either installed then or they put a newer tranny in the car.
The point is you need to check the parts on your T-bird to see what they are before you start swapping.
Does the T-bird have the larger Mustang TB, MASS AIR and injectors? The cam would probably be a better grind with the Mustang too. You also want the stock (or better) Mustang headers.
The long block should be the same but without the forged pistons. It should have E7 heads.
I'm sure there's other stuff but this should get you started.
Well, so far it has appeared that the previous owner was an asshat. The only things he did to it where stupid Ricer junk which I reversed when I first bought it.
He had a MAF installed in a plastic tube, I replaced that with a mustang MAF. I highly doubt that there was any internal work done. The engine doesn't seem to have ever been pulled before. I think someone had told me the intake I have is the Gt-40 style. I do not believe that the throttle body has been changed.
It still has the ultra pinched 'luxury' thunderbird exhaust manifolds. I'm fairly sure the injectors are stock as well. Really the only thing on it I would call a 'mod' is a different shift lever, which was installed like ass.
I don't really have the money to tear the engine down at this point, this is more of a 'get-R-done' type situation so I can park my 300zx and start building it up in a few months. When the Z is ready for the DD circuit I will be parking the stang and doing a real build up.
This is more a case of what will work, and what absolutely will not.
I am most likely going to try and find a set of mustang headers, or at the least stock mustang manifolds.
Since my car is gutted down to bare bones, and I have a lot of room for changes, I am going to try and use the thunderbird wiring system for now.
Thanks for the info, If anyone has anything to add, I am all ears!!