Flex plate torque converter help please?

[wetfeetmi]

 I am using an '84 318" truck motor in my Daytona clone and my '72 727 torque converter won't mate to the flex plate. I ordered new "correct" plate from Napa and it is identical to the one I had on the motor in the first place. I ordered another and it was 11" instead of the 10" that came with my rebuilt 727. I am at a loss as to what to do next. The hub on the converter butts up against the crank and leaves about 1/4" gap between the 4 converter bolts and the flex plate.
Any advice would be greatly appreciated. Rick

[John_Kunkel]

Have you measured the register bore in the crank and compared it to the hub on the converter? The converter hub should be 1.810" and the register bore slightly larger.

If the converter hub measures OK, the crank bore may be damaged or it might be a standard shift crank; some stick shift cranks will have an unfinished register bore.

[wetfeetmi]

 The hub slides into the crank, but bottoms out against it. The 318 had an automatic bolted to it when I took it apart, but I am not using that trans. I am using a 727 (1972) that I had rebuilt. I thought this combo would bolt together.

[John_Kunkel]

The crank register should measure about .650" deep, if it does the converter hub is too long.