Got the heater box back in my 72 Challenger but having trouble with vacuum tube routing ! Especially one from engine compartment ? Any guide to vacuum routing diagrams and where vacuum originally came from engine??
The nipple on the rear of the intake manifold that has 2 fittings . A large one for power brake booster vacuum and a very small on that id curved to point up that the small vacuum line attaches to. As for the rest, there is a diagram in your Factory Service Manual that has that info. You will usually find most answers in the Manual.