Just wanted to give an update: After back-flushing the block with a garden hose/air hose (I found a post by Hotrod Lincoln, I believe), the engine is back together and is no longer overheating. Whether it was the new head gasket or back-flushing a ton of rust out of the block or having the radiator cleaned and repaired, I guess I'll never know. Thanks to everyone for their help.


My dad always told me, "Don't force it, get a bigger hammer".