Am I wasting my time with my 66 forged crank because of its 1.565" torque converter pilot hole? I want to use the crank with a later (67+) tranny and torque conveter, is there an adapter that I can use?

The 66 crank is a nice forged unit but as you know, the small pilot makes it a "pain" for converter selection.
Drop my a private message and we can talk about getting you a later forged steel "big pilot" crank.
DD