Apologies if this has been discussed before. Helping a friend with getting his '65 413 reassembled after recently getting it back from machine shop prison. He bought this engine about 20 years ago as a low mileage C Body core. I noticed this has the rocker arm shafts with separate pedestals, not heads with cast-in perches. How do the pedestals get removed from the shaft to replace the rocker arms? Just asking in case the owner wants new rockers. Thanks