Push Button Automatic

The driveshaft/trunion bearing issue can be resolved by using the tail shaft from a 65 trans. You could also just use a 65 trans with a 64 valve body to maintain the PB drive. The 65 valve body has a slight different fulcrum in the shift linkage and doesn't work properly with the PB.

Floor mounted PB shifters were very common in the 60's drag racing scene in non-PB cars.