[25stevem]

X2 with the above!
Careful check the top and bottom compression ring groove clearance.

Take a good ring and snap it in half , then use that a a set of feeler gauges to check the ring groove clearance around the perimeter of all 16 grooves.

Since you are using a used ring to make this check if you find more then .004” in clearance then that piston is done.

Word to the wise for used motors that are being considered for rebuild that you yourself have not
rebuilt is to start off by making a list of everything that could be needed and then scratch off what you find you don’t need!
Include the ball park cost of each item in your rebuild list also.

If you find you need to go for new pistons do not even consider the cast ones that are stated for usage with both early and late heads

Since you have found some broken rings the heads will need a valve job and even if by some stroke of luck they do not you should plan on replacing all the valves.

Depending on the valves you use this may also involve cutting the tops of the valve guides for positive type valve seals of the non Teflon type.

PS.
I can’t see why you would need new wrist pins if the piston skirts look ok.
Anyway the pins are one of the easiest things to check anyway.