273 Commando Slugs

Your points are valid. I'm sure moly rings would seal more effectively and make more power. The cast rings lasted for 40+ years and should work ok in my basic
rebuild. I read a couple of piston/ring articles and I came to the conclusion that
for a race or high performance street engine, forged pistons and moly rings should be used. Especially if you're going to rpm the motor to get horsepower. For my basically stock rebuild, cast pistons and cast rings will do just fine. The last paragraph sums it up for me.
http://www.carcraft.com/techarticles/piston_ring_technology/index.html