be nice if you can find some vortec heads and intake. 1995 and newer 5.7 litre chev pick ups have the vortec heads.but you'll need to change the intake , maybe a 680 d.p. holley carb,a set of headers , and , sweet.
if not, a good set of 882 heads will do nice for the street if you clean them up a bit with the die grinderand go 202/160 . it will pull you back in your seat a bit too.----- mike .