Stock Rocker arms clearances and fit

65 Cuda 340 said
In addition to the suggestions above (all good), I'd ask, do you have an aftermarket cam? Hotter cams have a smaller base circle and the OEM pushrods can end up too short.

Reground cams have a smaller base circle. Chevies need a smaller base circle with a higher lift cam in some cases.

Mopar cams are higher in the block so you seldom see small base circle cams.