2. A 64 torque converter's snout is too small to snugly fit into the back of a 77 crank. I.e., the early trans will bolt to the later motor, but the crank won't hold the early torque converter centered. You need an adapter ring to fit over the torque converter snout to precisely locate the converter in the crank. The torque converter bolts alone won't do it.
Ask your mechanic if he used the crank adapter. That is in addition to swapping the flexplate. Very important. If he didn't install the adapter, I have them available. send me a message.
