heads
 

if i put new heads on my stock bottom end will that $^#% it up?
the heads are roush 200

Uhh........No.

the heads alone wont harm a thing. What plans do you have with the car? power adder one day? whats the rest of the combo?

i was thinking a b303 cam, trickflow intake, roush 200 heads, and maybe a supercharger someday. i already have mac longtubes, off road h-pipe flowmaster two-chamber 40 series. I have desktop dyno and it said that the combo would be 380 hp and 410 lb of tq.
that program is awesome! It is suppost to be within 5% accurate of actual horsepower.

What year mustang? With the 200 heads you might have to flycut your pistons before you can run them.

my car is a 91' gt

You may have to flycut, but forget the b-cam.

DEFINATELY will have to flycut the pistons !!!!!!!

definately forget the B cam, its crap even for my combo, let alone a serious aluminum headed combo like you will have.

go after an FTI (Ed Curtis) or Anderson cam, and you will be MUCH happier than any motorsport cam