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Fred, put your timing pin in like you're timing the car, and turn the engine by hand. If the gear is loose you might feel a wobble. Did you torque that gear nut down tight, I mean
really tight, and install that spring and plunger setup correctly in the timing gear cover?
The other suspects would be rods and mains. I hope for your sake that's not it. But it wouldn't be the end of the world. A lot of work to pull the engine, but Bill Barlow could pour new babbitt for you and have your block back to you in a few days.
I run 10-30 year round, and have for over 50 years, and have never had any adverse issues regardless of temps.