1974 Dodge Dart Magnum Swap

After pulling the trans 3 X. Had it disassembled and checked for all rotating pieces being straight and in balance, then Changed Flex plate 2X. Changed torque converter to a custom 3,000 stall, changed the Mopar balancer with another 5.9 Magnum balancer(both were new)with the same results. Vibration...
Save yourself the grief I encountered.. BUY a "Professional Products" Harmonic balancer.. Part # 80012. $97.00 from the distributor. They come with 3 sets of weights. They will work with all LA and Magnum engines. And, as I stated, early 5.9 EXTERNAL Balanced, Later 5.9 Internal balanced. Ask me how I know?? See above:)