[CarolinaHD]

I agree with Bobb but if you're dead set on upgrading to something, grab a Hydroboost and master cylinder from a 2002-2011 2500hd or 3500. 1.5" master bore but metric fittings for brake lines and power steering holes. Bolted right into my 67 c50 firewall although GM might have changed it by 1972

Have to bend up some hard lines and hit up a local hydraulic shop for the hydroboost hoses. Custom fabbed pushrod and some 10lb residual brake valves.

No need to worry about disc brakes. I can already lock up all 4 of my drum brakes- had to install an adjustable valve to limit the flow to the rear brakes.