hello everybody new member. i have a 1990 gmc jimmy(fullsize) it has 155000 miles on it i am planning on going through the motor this winter and was wondering if anyone can tell me how big of cam can i go with and how much compression with out giving the computer to much of a fit looking to get 350-400 horses out of it. this is my daily driver motor work not a problem i have drag racing for 10yrs now and building my own engines for 8yrs. but the computer has me wondering. thanks in advance.