Need a Mopar guru: 273 part-throttle ping driving me crazy!

d55dave said

Have you checked that the damper marks are correct, is it the right damper for the engine?

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It's a 7.25" damper and the previous owner said everything on the engine was original, he just "refreshed" it (didn't swap parts, etc.). I checked the damper mark with a piston stop before I timed the motor. It lined up.