My 70 Dart as of now

Hey Mike, that open hole is where the fitting goes to hook the vacuum hose to your intake manifold, without it I would guess your brakes feel much like manual brakes. I want to put mine to manual brakes as with the cam in my 360 I don't get enough vacuum to run them properly, besides the engine bay looks much cleaner without the booster, in my early A the booster is actually only millimeters from my valve cover. To go to manual I think it requires a different master and a different rod from the pedals. Not 100% sure, but thats why I come here to learn:cheers:
My car originates from Duncan too, wish it started out as clean as yours before it had paint, got a little mud in the back quarters, normal for a convert I guess.