A leak down test is definitely a good diagnostic approach. Keeping the piston at top dead center during the test is a chore. Another thing I forgot to mention is that when the block is shaved at the machine shop, the front cover that bolts onto it also needs to be there during that procedure in order to make them a level because the head rests on both of them. I made this mistake myself. There could be a step down between the front cover and the block which doesn't allow the head gasket to seat properly. It's easy to check by looking behind the alternator under the right valve cover to block vent hose.
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