The poly head has cast pedestals that have a machined hole into which the shaft slides. There are grooves in the rocker shaft where the head bolts go through the pedestals that keep the shaft from moving. There sure as heck isn't any easy way to take them out like on the LA motors.
R.

PS: I looked in my 65 FSM because I had originally thought there were pins. But MOPAR was a company of engineers and not using a pin would save cost and machine steps.