You are correct sir,The release levers turn the pump and the input is turned by the disc.With todays clutch technology you could make this into a highly consistent bracket transmission.Todays clutch setups take the "violent" out of the launch.
Gus

5418874-READY2.JPG (111 downloads)

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60