ya.... looks like the spring went through the chain, I'm bettin theres more loose parts because I don't think the spring put the dents in the piston & case. moot point really.
as for the valves....I wouldn't buy a set of used valves just yet unless they were low mile & cheap. if you don't know how to do it take the head to somebody that does head work & have it checked. when this kind of thing happens it usually bends a pair.... like both intakes or both exhausts. the cast iron guides are prone to cracking too.... the exhausts are tougher than the intakes.
edit: out of that ebay pile you might use 1 or 2 valves.... the rest you have. there are apparently 3 shims along with you may or may not be able to use them... it's a roll of the dice
you will no doubt need some different shims for setting up the head after the new valves are fitted (and some later when they have broken in).
a new valve is about 25-30 bucks (exhausts cost more) shims can be had for $5-6
Beezer screwed with this post 05-23-2013 at 07:18 PM