What are the cam & spring load specs? I just grind one edge on each lock half & check 'em on a spare valve, if the specs are mild it's not a big deal, but otherwise I make sure they won't butt.
This was actually an inexpensive ingenious exh. valve rotator from Mopar, the rounded polished multi-grooved locks will let the valve turn, grab a valve & install the locks & retainer pull & twist and You'll see.