I have a very similar combo 383, .600 roller cam and Mopar (Crane) 1.6 rockers and I split one in half right off the shaft a few weeks ago. I had changed my burnout style and was letting the 3 step limit the RPM's at 5200 and about 5 runs doing that one broke. So apparently getting into the 3 step during the burnout is a little rough on the valve train. I've since upped the burnout chip to 5800 so it barely if at all hits the limiter. It happened at the track on the 1st time run and I swapped the broken rocker for a spare, replaced the bent pushrod and have probably made 50 passes since (blessed with 2 runner-ups & 1 win). So I think swapping the rocker will be just fine. I checked valve lash again last weekend and it was spot on.