Own a 97 chevy silverado with a 5.7L 350. i have installed k&n cool air intake, air raid throttle body spacer, hypertch max programmer and tru duel flowmaster exhaust with 3" tips. wanting to put in more power by adding a better camshaft and lifters. any suggestions to what would go good with what i have and work with what i have. its the last thing i want to do to my truck. any help is greatly appreciated