Cam Operating Range & Highway Driveability

Converter. That is what gets the motor to operating torque.

Also Install a factory (Part throttle kick down servo).

The servo makes the biggest difference in performance at highway speed . You find them on most older/6 or fleet/police cars. Three screws hold it to the side of the valve body. I put one in all my cars. Unbelievable difference in the performance on my Power Wagon's when plowing. extends trans life also. They are different from early models to later models but 904 and 727 are the same.