I think the Master cyl is from a early 80’s corvette and the hyd boost from a Astro Van – Custom plate on the hyd boost to bolt to the firewall

The snap ring ears in the master cyl were rubbing the hyd boost piston – So I had to grind them down – No issues after

Proportioning valve

I had the master cyl ceramic coated

The hyd boost push rod was about 2 inches longer than the original – So this made the bake pedal push up way too high – I removed the aluminum bushing that holds the pedal retaining rod – Drilled a new hole 2 inches back -Tack welded in place and painted – Reinstalled

Brake pedal installed with new bushings