Vacuum reservoir for power brakes

It’s an MRL 360 Cruiser.

LA 360 Block
Summit Cam
284/228 .480 lift 112* LSA 108* ICL
Compression 9:1
2.02 / 1.60 valves stock heads mild porting
Airgap intake
Edelbrock 600 cfm 1406
73 340 exhaust manifolds

I have power brakes, just wish a little more assist.