Only wild card that blows out a lot of guesses is the closed up sparkplug gap. We can come up with some cool scenarios, but the closed gap still says something was floating around those three cylinders and not a bottom end seizure -- but mild since the borescope didn't find any massive trashing.
Did you try and turn the engine once the starter was dropped and the starter pinion was off the flywheel? There's a possibility that the starter dying after engaging the ring gear could keep the engine locked up. Even if you get lucky and the engine turns over after removing the starter you still need to trace down what closed up the gaps.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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