1000MI and blown HG teardown pics and questions

Cam looks fine. Valves can rotate so the wear pattern looks normal. Did you have any issues with it spark knocking? That'll push a gasket out. Running lean sure doesn't help either even if it's just a short time. Was the block decked? Thin gaskets like that require a real flat sealing surface on the deck and heads. If going with Cometic gaskets make sure the block is super flat and decked to 50RA or finer or they may not seal