Need a hand identifying...

It has a single pin neutral safety switch and 68 was the last year they used a single pin switch. Assuming it's original switch that means it's a 68 or older trans. You definitely need to measure the torque converter register. It needs to be 1.81" od for a 68 or newer engine. The good thing is if it is a small hub converter you can get an adapter ring from Torqueflitepatty on E-bay for about $30 to install on the converter to mate it up to your engine. If it were the other way around (67 or older engine with a 68 or newer trans) you'd need to have a torque converter special made for it.