Sadly sean and paddlen are 100% right.. The only american sports car that comes close is the camaro/trans am FB or the corvette, the mustant in all its glory still had drums and was way behind GM imho and always was.
Its all about the suspension, if the car handles better then you can drive faster with no worries. I still think the cheapest, easiest car to mod would be a camaro/FB/TA but they really dont have much sophistication like a supra or even an integra has lol.
Still, a nice worked 383 stroker into a 1985 camaro with a good 2 speed powerglide or maybe a 5 or 6 speed would be nice. I know my friends 92 stang witht he 383 was sweet.