I'm building a street stock motor, and as we all know their are certain rules we are "supposed" to abide by. Mainly what I'm needing help is with heads. Not sure what to go with. We can run and stock gm head or vortec replacement.. Has to be cast iron heads. I'm leaning forward the RHS vortec replacements.. Any suggestions is greatly appreciated. Oh yeah, no porting or polishings of any kind. Can run 2.02/1.06. Thanks.