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Take the heads to a machine shop and have them magnafluxed to see if they are cracked. It will only cost a few bucks (it would be nice to magnaflux the block, but getting it to a shop will be a bit of a pain, so maybe bypass doing that). If the heads are fine, clean everything up really well, reinstall with new gaskets, and reassemble after oiling up the cylinders with clean oil. Remove the oil pan after removing the oil. Clean the bottom end up as well as you can, maybe with Berryman's followed by WD40 or something like that. Replace oil pan. Change the oil. Drain the cooling system. Replace the thermostat. Refill with new coolant. Try to start the engine. If it starts, watch for water/steam out the tailpipe after the residual moisture has had a chance to burn off. Check the oil dip stick and see if you see any water/moisture. If everything is fine, then maybe everything is fine. If the engine doesn't start, make sure its getting spark and fuel. Also, if it doesn't start, maybe do a compression test on all the cylinders. All of the above won't cost more than $100 and a few hours of your son's time.
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