It definitely has the 73 forged crank balancer.

Here is the converter and flex plate I removed.

897EC0B6-ED3D-4D54-B35F-CEA30E2BA4E5.jpeg278D40EB-EC40-4E33-AF6B-D8299B2F305D.jpeg

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