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The vibrations come and go at different RPM, I've had two motors that had the correct dampener and the incorrect converters, one motorhome motor and one 1971 U code HP motor with the big rods

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Any vibration at idle? IIRC, there was some vibration between 2500-3000 RPM while revving in neutral...

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every tach can read different a little, its been a long time ago on the U code 440 motor but I remember it shaking a little at idle and quiet a bit more at 2300 RPM in nuetral Buy the correct converter or a B&M flex plate and add the proper weights