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The depth of the backside(transmission side) of the crankshaft flange to the back of the block is different(longer) on the old top fuler cranks than the stock later model(1962 and up) cranks are   Several solutions as already mentioned, one not mention is a thin spacer plate between the trans and block to move the trans back from the crank flange 
any idea of what the difference is ..? maybe i could machine the flange thinner leaving a step register.
.100 " longer in the back and .100" in the front for a bryant fuel crank
As for the adapter rings
I called kb and he said that he has them in stock and is looking at one in his hand as we talked on the phone so I ordered it . I waited a month and a half and it still never recieved it , so I machined one my self . A week later the one from kb shows up
I think ATI sells the adapter also .
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