The Buick pistons that Jerry is recommending will come about 1/8" short of the block deck, which will reduce the compression ratio (and power) a bit.
If your 216 is standard bore and not worn badly, pistons for a 1950 Chrysler in 0.080 oversize will work with the piston crown less than 1/64" above the deck. They have piston pins slightly smaller than stock, but can be reamed out to fit stock piston pins. If your 216 has been bored and the wear doesn't clean up at 0.0175 oversize, the Chrysler pistons won't work.
My block is due back from the machine shop for the modifications to the bearing web. A Melling M29 oil pump has been adapted to provide more oil.
Here's how I did that.
