that is all i did on my 73 duster..

replaced master cylinder with newer mopar with adapter for two bolts..

bought manual pushrod...slowly bent brake lines to line up with new master cylinder.

Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)