Doing my heads soon, what all do I need?

For the lower intake gaskets, I'd recommend the Fel Pro's w/ the rubber ends (not cork!). You'll need an upper-to-lower intake gasket - Be sure and get one for a cobra intake, not stock because they're different as I'm sure you know.

You'll need new head bolts because they stretch and can't be reused; you could get head studs if you wish-they're stronger and can be reused a few times. ARP makes good stuff, so I'd get ARP bolts or studs. Get some ARP thread sealer for the lower head bolts and anti-seize for the top bolts.

Yes, Head and Header gaskets are seperate, so you'll need header gaskets as well. You might consider some Stage 8 Locking header bolts...a lot of people have problems w/ their header bolts backing out and these header bolts won't back out...I have them and they're good stuff.

Change your PCV valve and screen if it's been a while since you're back there anyway. A lot of people say to get this stuff from ford because they don't like the auto-parts stuff.

To help line the lower intake up, get some bolts the same size as stock, chop the heads off and use them as dowels - put one on each corner and drop the intake over them...lines it up and no messing around w/ moving gaskets and junk You can either slit the ends and use a screwdriver to remove them, or use vice grips.

To sum it all up:

Necessary/recommended:
Fel Pro lower intake gaskets w/ rubber ends~$20-30
Cobra upper-to-lower intake gasket~$20 for 5 I think
ARP Head bolts/studs~bolts=$40-45; Studs=$100
ARP Thread Sealant~$8-9
Anti-Seize~$5
Header Gaskets~$15-30

Optional:
Stage 8 Locking header bolts~$40
"dowels" to line up lower intake~$1
PCV valve & screen~$10-20

hope that helped

EDIT: If those are GT-40P heads, you can take your stock plugs back because they won't fit. I can tell you the plugs I have if you want-or you can search. You can also order some GT-40P headers because stock headers make it a pain to change spark plugs.

BTW, if you desire at any time to paint your headers while they're off...don't unless you know of some good high-temp paint. I used 1500* safe paint from autozone and it flaked

I doubt auto stores carry ARP stuff, so if you're going w/ ARP, you'd prob. have to order it from a speed shop or summitracing.com or something...the auto store may be able to get 'em for ya too. Don't forget the arp thread sealer.

I did mine myself for the first time last december in 25* weather outside, so keep your head up...it could be worse lol. Stangnet helped a bunch of course. Don't get in a hurry, read directions and post if you have any problems/questions. Take your time, torque to spec., clean everything really well w/ brake cleaner or gas. You might want a gasket scraper if you didn't include that in your list.

I'm really not sure about plugs; you could run a search or post for that.

youll need to replace your thermostat gasket and while your at it replace the throttle body gasket, i just did mine