I think my 727 is fried. Now I'm at a crossroads...

Swinger 340 said

Pull all the plugs and check them also. All carbon fouled ? too rich fuel, wrong heat range or just the two, change out the two wires, maybe they are old and shorted out. Look at the wires in the dark (motor running) and look for an arcing. Uncross wires.

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Pulled the plugs yesterday and they're all rich. My wires are new and I've confirmed continuity, plugs are heat range 5. I will say that I richened the idle a bit because I suspected a lean condition, so that may be the cause of the rich plugs. I'll do a compression test once the engine is back in.