Air gap intake and heater hoses

Well, brass frost plugs are fine. They are not being pushed/pulled by a hose connected on one end to the body and one end connected to the engine. But, since you have the brass fittings already, use them. Obviously, they are not really "wrong". It just isn't what I would have bought for the application.

Sure but the other end of the hose is attached to a heater core... not exactly bullet proof strength there with that paper thin beauty. With the hose holders in place nothing really moves. You're right pointing out that you don't want the hoses moving around too much.
I'm going to set mine up like you have yours. That's ideal... nice tidy engine compartment too... looks great.
What pulleys are you using there? I need some like that.
Is that a brass fitting on your fuel inlet? :) kidding!
hose routing.jpg
I used to have a 69 GTS... worst (auto related) mistake I ever made selling that car :(
Dodge rear.jpg