Choices and more choices.. I think everyone here have their outlook on what parts and combo works or more cost effective. And a 20 year old will see it in a different light then a 45 years old. Best is to get a test drive in as many different Mustang as possible. Go to the local track and check out the different combo. Talk to the racer. I am learning everytime I hit the track and log on to my computer.
I agree with time only. There's a million combos that you can build. And everyone will have a a different opinion, best thing you can do is start reading, this is the perfect site to dig around and see what you like and don't like. Go to the track and see what works best. Eventually you'll start figuring out which direction you want to take it.
Youre going to see anywhere from 50-70 HP gain from a good H/C/I combo. The GT40's are nice and you cannot argue with genuine Ford design, but if money isnt an obstace then I would suggest an aluminum option to reduce weight.
that prolly wont even get you a mid 13.. here's my cheap ass way to a quick 5.0... gt40p's stock cam -4 good intake mani (systemax will work fine) 70mm tb 70mm maf (off a vic) mac longtubes underdrives take all the smog crap and a/c off 3.73's minimum (4.10's best) and yes you can cruise with 4.10's your only going 2600 rpm at 70mph if thats too high for you, you should drive a diesel.. 3000 stall some form of shift kit for the aod... mickey t dr's that will put you well the 12's and its pretty damn cheap..
Put 3.73's in and swapped in a 5 speed, not bad... GT40P's with 75mm TB and Exploder intake, B cam, 73mm MAF WAYYYYYYYYYY better!! Good low end, and when you let the RPM's climb.....
see here's where common sense comes to play, an engine is one big air pump. why have a bigger tb than maf? that makes no sense!! i mean yeah its only 2mm diff but, at the least have the maf bigger than the tb.. to the op, stay with the stock cam, it has been 11's na on gt40p's a bunch of times, however they are not running 3.55's with stock stalled aod's, they have either stalled aod's with 4.10's-4.30's or a stick with good clutch/ alum flywheel and nice ole 4.10's 4.30's.. my good friend has an 88gt stock gt40's, rr's, cobra intake, stock cam -4, 4.30's and a lightened stock bottom end and has been 11.90's with it.. still has full interior, and it sounds like a stock car..
That's up to you. If you know how to drive the 5 speed, and I mean really drive it, it WILL be faster than the AOD. Quite a bit faster. Personally I would swap it to a 5 speed yesterday. Bigger throttle body, bigger mass air, long tubes.