Thanks! That was good information.
So, with the vibration I described, could it just have been the converter?
Based on the photo information, do you think I have a forged crank 440?

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