Head coding?

I have found a 340 motor I am thinking about buying. It is torn down...all i see is a few pics price is 600

Block casting # 2780930-340-5 date is 011571
Heads casting # 3418915-H

My question is what does the H indicate in the head casting number and is this a good buy at $600...condition is really unknown until it is checked but?

Do the valves look to be 2.02 or 1.88?

Attached Images
File Type: jpg block.jpg (48.6 KB)
File Type: jpg heads.jpg (36.6 KB)
File Type: jpg heada.jpg (52.4 KB)
File Type: jpg crank.jpg (42.3 KB)
Author: knahavasu