It had a vibration that came in at about 3500 RPM. It had the round flex plate with the bite section, and the converter had 3 weights on it.
I was thinking this being a steel crank motor with these parts was the cause of my vibration.

F.A.S.T/1969 SUPER BEE/383/AUTO/AVS 11.58 @ 117.98 1.71 60ft mph F.A.S.T Legal

1969 DART SWINGER/340(420CI)/6.52 @ 105.39 1.45 60ft (1/8 mile)10.22 @130.5 (1/4 mile)

Harry