I have done a couple of these.Look into a Ohio crank 3in main rotating assembly.Getting a free 3 1/4 main cast crank still needs machine work to cut it down and cheapest is to also cut the Js to BBC because of so many rod choices.You will need to use a thrust bearing spacer with the 3 1/4 crank also.The one I’m doing now I will use 6.7 rods.Tom
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