Spun a bearing in my 92 Chevy 3/4 ton van....ruined the crank(typical 305 prob). Found a used 40,000mi crate with bad heads. Since the heads on my engine are good, I bought the crate and put my heads on it. Ok..my 305 had the stock GM pistons with the valve reliefs cut in them but the crate had the dish type pistons...QUESTION !! Are the valves going to clear the top of the dish pistons??? Any ideas will be appreciated. Thanks