No, there is not enough "meat", to turn it that small. Cure:
1) Get a "hybrid" converter from Dacco Home | DACCO
2) Swap out the front section of the trans (pump, shaft, clutches/plantary) for the early trans parts.
3) Remove the crank and have a machine shop bore the hole larger, or replace crank with 68 up unit.
I ran into this putting a low mile 65 slant in a 80 pickup. Believe it or not, the cheapest fix was to buy a reman crank kit for a 68 up slant, and put it in the 65 motor. Comes with new bearings as well. Simple two hour job.
