Pull the plugs & check for electrode damage. Remove the valve covers and make sure a valve hasn't dropped and check the springs. If all looks well, test the spring pressures. Ask a buddy, engine shop or rent a lighted scope and look into each cylinder, check for any ring, piston, skirt, and wall damage, also look into the intake/exhaust ports. Take the
oil pan off and look for a spun bearing, at higher rpm, that can happen. If no damage, remove all the bearings for inspection. Try this before removing the engine. Hopefully everything is minor, and I'll be praying to the side oiler gods for you.
Let me know what you find.
(Funny story. We check the valve lash every week on the sprint car. Two weeks ago, I removed the valve covers, checked the spring pressures keepers ect... removed the headers & left the ports open so I could inspect the ports, cylinders ect., Next morning I couldn't believe I did not cover the ports with duct tape. I don't know why but, decided to use my scope again, what did I find..........a alcohol soaked, JUNE BUG in #4 exhaust port ! LOL ! I blew & sucked up what was left. Who knows if it would have caused any damage but at least, a piece of mind. Moral of the story, duct tape has many uses and maintenance...maintenance & more maintenance.)