All depends on the rest of your combo ,is it a late mod block ,what carby and intake . Is it an auto or manual and what are you after big hp or something that sounds good .If you are buying a crate engine what size and just order one with all the bits . A comp cams cam thumper series go and sound great and for heads AFR or trickflow will do the job .Its a whole package that does the job not just heads and cam even though thats were the HP is made ,heads are most important . Over the years engines have not changed a lot when doing up our model engines ,carbys ,intake manifolds ,cams ,pistons and the rest is the same its the cyl heads have and that means HP .
