Flex plate cracked

It's a 68 engine & trans. The torque converter fits the crank too (I measured it last night).

Good, it was just a thought, as I have seen quite a few engine swaps, where this was over looked. One other thought. You do have the proper nuetral balance converter, right? A cast crank small block 904 converter will fit, but will be out of balance for a slant six.