What brake booster master cylinder do I need duster

A '74 proportioning valve is included in the '70 and up distribution block with switch and proportioning valve.
I beleive the combo valve is the same as used in the earlier years as the pressures it proportiona re about the same.
Visualy it looks like the one in the upper left corner.
1972 Imperial & Chrysler Disc Brake Service Repair Book from the Master Technician's Service Conference (Session 293)

Master Cylinders will look similar to this:
1973 Chrysler and Imperial Brake Reconditioning Repair Guide from the Master Technician's Service Conference Session 309

'73 used a different master cylinder for power and manual disk setups.
FWIW here's my work in progress crib sheet for Original A-body Master Cylinders & Bore. Feel free to add, question or correct (especially if you have a documented source).

years___Application_____________p/n_______Bore
1966... Fixed Ft calipers, Manual................1"
1966... Fixed Ft calipers, Power..................1"
67-70.. Fixed Ft calipers...........2808600.....1"
71-72.. Fixed Ft calipers...........3461178.....1 1/32
73-74.. Floating caliper, Manual..3580146.....1 1/32
73-74.. Floating caliper, Power.. 3580112........15/16

1976?...............................____4647..........15/16