Proportioning valve question

Dana67Dart said

up to some year the disk / drum proportioning valve was a separate valve mounted to the rear (6 inches or so) of the distro block in the rear line.

there is a later year ( 73???) distro / proportioning valve combo that might bolt into the same location as your distro valve with only minor movement of your tubes.

If it was me I would opt for year specific parts, less issues down the road.

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Thanks for the reply Dana67Dart. Point to stay with year specific parts is well taken. Have made an effort to do just that but availability of parts and lets not forget my misunderstanding of options has led me astray at times. Sometimes I just do nothing. Have contemplated this brake issue for quite some time. I could go larger drum/drum without issue.

Am I to understand correctly a smaller rear wheel cylinder will compensate as well? That's not stepping too far out of bounds. I am also very reluctant to purchase non Mopar disk brakes. What happens if I need replacement parts down the road. I have already forgotten what year front calipers I have. Think they are 73 or 75. The Kelsey Hays option sounds great if I want to stick with 4 inch bolt pattern and skinny tires. That was my original plan. Have all the makings for rear drums 10 x 1.75. Probably more money to flush.