i dont even know what type of pistons or what brand that were used.
i can tell its 40 over because of the stamping on the pistons
and they have some type of vavle relief
if it was required to change them yes i did hear the motor run sounded like it had a mild cam in it maybe an rv cam
as of right now the 350 is short blocked
when pulling hte oil pan off there were no shavings in the pan
iven ot takin any rods lose to see if crank has been turned