Ok, I decided to do a top end on my 81z, It is a stock bottom end on second rebuild with maybe 4K on the second rebuild and 882 heads. I am looking at the Scoggin vortec kit, already ground for a 525 lift cam. My other option is the Pro Comp aluminum heads with airgap intake to keep me in the same budget range as the vortec kit from Scoggiin.. Which would give me the best bang for the buck? Also which Cam would you suggest for each application.