My SB Ford is a crate 5.0/302 with the Ford Racing 'E' camshaft and Crane Energizer 1.7 pedestal (bolt down) full roller rockers which were what Ford also sold (mine actually have a Ford p/n on them. The heads were new, not used GT40P. The 1.7 ratio changes the effective lift from .498 to .529 and will change the camshaft duration by a few degrees. I've also used the 'recommended' Crane springs, locks and retainers to keep away from coil bind. These are the positives. And it does run very nicely.

I'm not totally happy with using an unknown manufacturer's 5/16" hold down bolt and may see if ARP has a super strength replacement.

Any other negatives are unknown. The engine builders here must have some knowledge. I have a couple of ideas, but want to see if they are the same as my "guesses" and discuss from there. It's not a racing engine, so no long high RPM runs.