half the time i pull a piston and rod from a valve hit like OP's, i find that the wrist pin has a scuff and or dent mark like wear . Not all the time, more so on small engines like dirt bikes because of the higher rpm maybe.
Still, you want to blue print that engine if your planning on fixing it. like Ol'Rattler said in #3, do those things first as they are the best and cheapest way to find out if its worth saving. then start blueprinting the entire engine. nothings worse than rebuilding only to have something go wrong because you didnt catch a issue that is invisible to the eye!