Just Purchased Virgin 340 Short - What to do with Pistons

Well that's a 69 block
But I do not believe that is factory paint and it appears that those freeze plugs have been replaced.
My guess is that that engine has been apart before.
Yes! That's my latest engine. Bought it a couple years ago from another member here. I wanted another backup, one that could meet SCCA Street Prepared rules without a major a hassle. It's sitting on the stand now. I need to clear a few projects that became higher priorities before returning it.
My decode on it is here: 1969 built 340, unknown car.

IIRC I used a couple books (Taylor and the FSMs) and this
How to ID a Small Block Engine Block: