904 converter ID

I need some help to see if I can use this Hughes converter on the LA 360 that I am putting my my newly acquired 72 Dart. The car came with a 5.9 Magnum and a 904 with this converter installed. I was hoping by the numbers someone can tell me it this will work as is with the stock flex plate, or do I need to knock the weight off of the converter, and use the B&M 10239 flex plate. Thanks in advance!

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