340 questions - anybody recognize these pistons?

sounds like a nice crank & if it specs out and the block you have a nice start. you will want to get them checked out and the rods checked too before you buy any goodies though.

if you get the AOK, and the machine shop says they are in good shape, i'd recommend a set of pistions to get you to 10:1 and some aluminum heads.
it all depends on your goals.

the X heads are good for someone doing a numbers match restore so they would have good resell value, and would fund your aluminum heads.
the X heads were good in the day, but no match for current aluminum heads. (multiple benefits - weight, detonation resistance, run cooler, usually flow better unless the X heads are heavily ported by a pro, etc.) if you were restoring a car 100% you might need a set of those heads to make it "show ready" i would not recommend putting money into the heads for street/track use.

i've heard mention of these heads, if you were in the market for a set i'd ask around to see what kind of experiences people are having:
Airwolf 220 SB Mopar heads
http://www.j-performance.com/index.php?option=com_content&task=view&id=59