Alright, I got back to it today. Removed everything in the way and removed the valve cover and exhaust manifold. Cranked it to verify full/proper motion. Everything seemed in order. Then, I removed wiring and distributor and pulled the intake manifold and the starboard side head. Head gasket had a large gap between cylinders 4 and 6 - right where I'm having low/no compression. I also noticed a rather large amount of rust chips in the coolant passages of the head and somewhat less in the block. Is there a procedure to clean those passages out? Also, is resurfacing absolutely necessary or potentially avoidable before reinstalling the head and new gasket? Pictures of block, head, head gasket, and coolant passages to follow.
