I think I have the backup parts you're looking for. a bracket that holds the switch, the switch and the reverse lever that goes to the linkage. Its off a 68 400 with muncie and hurst shift.
Bob May, I sent a pic to ya of those shiftier parts. Just checking if you got it. Or if you still needed them. If so, holler, if not, no problem. Just checking. Have a good one.