Power brakes vs intake manifold 72 Demon

Not quite sure what you are asking, so dont smack me lol. Heater hoses hook to the top of water pump and to the front top of engine- on manifold. Manifold gasket is cheap and can get at advance auto, etc. Cam you just bought sounds alot better than the one you had already. Brakes prob suck because your cam setup didnt allow for good vacuum. Dropping down the cam to the new one you just got should help. If not- get a vacuum booster canister resevoir.
Hope this helps? Im thinking of a 360 setup.