340 Chugging instead of Reving

RustyRatRod said

Just for the heck of doing it, start it up and cut the lights out and look closely at the the plug wire connections on both ends for sparks to ground on the plug side or arcing between cylinders at the distributor. Costs nothing and only takes a minute.

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Thanks for the suggestion RRR,
With the lights off in the shop, there was no sign of arching anywhere under the hood. The coil is mounted inside the car, I checked there and where the coil wire connects to the moroso bulkhead feed though. Pitch black.