I installed a set of 1950 Chrysler pistons in my 216 with the 235 crank and rods. They had 3 compression rings and an oil ring. There were no markings on the compression rings indicating which way was up, indicating they were symmetrical and could be installed either direction.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.