i have a 1990 LX mustang and i pulled the motor about 3 months ago i havent had a bit of luck since. i had the motor bored 30 over and had some alum pistons had the motor balance and clearanced. i had the stock heads on it before.And then put some 351 heads on it the heads are still considered a small block head i get it mixed up all the time its ethier Windsor or Cleveland but i left stock cam in it its a roller cam with new roller lifters. now i got it runin smooth like there is nothing wrong but now its atleast a whole second slower on the track its slower then it was before how can that be. now do i need to get a different cam are the cam specs different for the 351 head to the 302 head i believe they are, WHAT DO I NEED TO DO? u can post here or email me at Adam949@yahoo.com