340 to 360 Harmonic Balancer Swap?

I believe the flexplate part numbers johnny offered up are "if" you have a 318 or internallybalanced 340 ,273 or 318 to install externally balanced 340 or 360 with neutral balance convertor....hell I'm gittin confused now....

Johnny Dart said

You running a 904 or 727 ?

B&M External balanced 360 flex plate:
904 part #10239
727 part #10236

360 balancer P5007301

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