I bought a new HEI distributor. I have been working on it with a friend. He timed it for me but where he located my vacuum advance, it makes the car idle rough and it vibrates the engine. When I re-locate it to a different spot on the carburetor it seems the vibration goes away but he's telling me I don't have any vacuum there when he tested. I guess I'm confused. I can't seem to find a diagram that will tell me what each ports are.
