340 to 360 Harmonic Balancer Swap?

kenicb said

OK thanks Johnny. That certainly simplifies matters. I found a 360 balancer. So all i need now is the B&M 904 360 externally balanced flex plate from Summit. The torque converter can stay the same correct?

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As long as it is "0" balanced.

The B&M flex plate is designed to couple Externally balanced engines with
"0" balanced torque converters. There should be no weights on the converter.

For example: The 1973 cast crank 340 had 4.22 ounces of weight added to the converter. So........

I used a 904 Mopar Performance converter I got off E-bay for cheap. If you need some part#'s let me know.