The B&M flexplate you have listed is for a 360/727 Externally balanced, your converter has a weight also,...IIRC the B&M flex plate is of there "conversion" line, meaning if your converter was a standard say 318/340 internal assy, the conversion adapter B&M flex plate was to compensate for the balance requirement that a internally balanced converter wouldn't have,...I recall doing a BB cast crank swap using a B&M conversion flex plate years ago....IMHO you have to either replace the flex plate with a factory flex plate, or loose the weight on the converter,...but consult B&M first as to your use of their plate and your converter choice


IMHO, I'd cut the weight off