can someone tell me what size cam you can put in a stock 1990 mustang gt. some people tell me that the lift cant exceed .512 and some say .544. I was leaning towards the e303 or maybe the f303 but maybe someone can recommend a different cam besides the motorsport ones. i plan on using the same rockers but i'm going to get new lifters. Will any brand of roller lifters work? I'm also going to use gt40p heads and a cobra upper/lower intake. Any help will be greatly appreciated.