My internet is too slow and my patience to thin to watch youtube, but if you have stuck pistons and plugs, remove the intake manifold and pour each head port full of penetrant, of which auto trans fluid is very good, and let it sit. Try to bump it back and forth periodically until it moves. If you can get the exhaust pipes off the heads without breaking something, remove them and fill the heads there too. It will eventually free up. You can sometimes speed the process by applying hair dryer heat to the heads and cylinders after you get them full of penetrant.
It's better to heat it first then add the oil.
The cooling will help pull it in.
