I recently bought a used set of edelbrock E-Street Heads. They have 1.90 intake and 1.60 exhaust. Model number 5023. They were the only ones in my budget and anything is better than the stock e-7 heads.. should I put a better valve train in the heads..( valve springs and rocker studs)? I've heard people tell me that they cheaped out on that part of the heads to compete with the cheap Chinese alluminum heads.. any opinions?