I finally got back out into the garage to continue working on this thing. Got parts and while giving everything one last look over before assembly I discovered the bushes on the offending rocker had worked their way to one side. I don't know if this the cause of the pushrod coming out from under the rocker, or if it was what happened after the fact. Either way I've got another rocker on order now too. Should have looked over the parts with a better eye last time I was out there.