Making the best of a bad situation

Well, back again.... sigh...

The car is still pulling to the right under braking. The shoes have been adjusted two or three times since the last post, and bled to death.
I'm now getting a hissing noise from around the pedal, which I'm told is a leaking vacuum booster. I'm so over this crap.

A front disc conversion will cost me at LEAST a grand, and would require new ball joints. I just had the ENTIRE front end rebuilt, so I'd be swapping out ball joints with maybe 500 miles on them, as well as needing another alignment.
At this point, I'm considering a stock drum/drum, dual circuit master cylinder. Pirate jack has them for $75. RockAuto has cheaper options, but I'd like confirmation on which one is correct.

MC1323 - 1960-1970 MOPAR A, B, E Body BENDIX 2660809 1" Bore Drum Brake Mopar Master Cylinder

More Information for QUALITY-BUILT M1516

Since I have no clue what pushrod is in there, I guess I should source the correct, stock rod? Can anyone show me what I need?

Also, there's a proportioning valve in the car (it was there when I got the car). I guess I could keep it and readjust for a manual drum/drum setup but, if I'm at this point, would you just put in a stock distribution block?
I've spent WAY too much time and money trying to get this bastardized combination working right.