68 slant six trans to 64 225 slant six

Wont work, easiest way is to get a 68 and up slant six.

Or you if you have another 68 and up (pre Cast crank) you can swap it into your motor to mate them together, its some work but yeah.

Then you can run a B and M shifter or any universal floor mount shifter eliminate the Ball and trunion drive shaft at the same time.