Which M/C Conversion To Use? ('65 with factory power booster)

As said, the Doctor Diff booster and bracket
Bendix Style Dual Diaphragm Booster for Mopars
A distribution block suitable for four wheel drums and a dual pot master cylinder
Mopar 1 Piece Distribution Block
And a dual pot master cylinder for four wheel drums, '67 and later, several different styles. For example:
1967: More Information for RAYBESTOS MC36221
1975: More Information for CENTRIC 13063018
You will need to bend up new lines from the M/C to the distribution valve, and tweek your old lines from your old valve to the front and rear. Alternatively, Doctor Diff (and others) have custom pre-bent line kits.
https://www.doctordiff.com/front-brake-line-selector.html
Mopar Front to Rear Brake Line Selector for A/B/E Bodies