Looking for some help and advice. I've got a 1970 402, I'm running Edelbrock performer 2 Intake and their #60479 aluminum heads. Engine ran great, but the other day the carb started leaking and i had a lifter tapping, so i decided that while i was at that i'd go ahead and install a new CAM and lifters. As i was tearing the engine down I found several exhaust push rods with damage on the rocker arm side. The push rods were stock in length. I just confirmed with Edelbrock as that being correct for that package. Now my questions...
1. Any idea as to what might of caused this damage?
2. When i put it back together do you guys think roller rocker arms are worth the money?

oh, my new CAM is going to be an Edelbrock #2162, can give the size if needed. thanks in advance for any help, David