I have no concern with the unbushed alloy steel rocker at that spring pressure as long as they are run on a correct matching shaft. I'm running comp's alloy steel rocker at or above that pressure with no problem as have others.

The Cat rocker does (or did) have extra material near the roller tip which could hit the retainer. Die grinder or file may be needed? In terms of rocker to shaft clearance and matching with correct shafts I have no way to tell. I also like the "plain bearing" type rocker vs the needle bearing type. The needle bearings change the balance of the oil system and may require additional mods like restrictors. Stock style lubrication of the rocker arm push rod pivot gets iffy.

On a budget, I guess I'd prefer a hydraulic cam with .5" lift or a bit more and OE stamped rockers vs mechanical cam with the Cat's.