I need engine tuning help.

The vacuum applied to the advance can at idle should be next to or nothing. It is supposed to be attached to a ported vacuum outlet. In other words, very little or no vacuum at idle and more as you accelerate. It should have little to no advance at idle. If it has more than say 5* you probably have it hooked to the wrong place. A dial back timing light is something everyone should have in their assortment of tools. You can get a decent one for about 20 or so bucks. Save your money and get the right stuff. Also, that Mopar distributor has two advance springs in it. A big one and a small one. Removing the big one results in almost the same timing curve as the MP performance unit. Those weights are really held back at the factory. Maybe you could hook up with a forum member in your area who could help. I wish you were closer. I could hook you up on a Saturday afternoon.