Attempt to Pay Back # 2

To All,

What is a reasonable drop in RPM from neutral to in gear? I am dropping like 400 RPM if not more. I suspect when it is idling at around 1100 RPM I am getting a tad of mechanical advance and vacuum advance as well. When I put it in gear the RPM's drop hard and the engine almost dies. I check the timing in neutral and it is almost 40 degrees. When I put it in gear it drops to initial or even a bit below. So I figure I need to add a light spring on the side that has the gap spring to keep the advance dead at idle on the mechanical. But I need vacuum earlier. This can does not even begin to respond until at least 9 inches. I am lucky if I get that at 1100 RPM let along 700 RPM. So the big question is where to I get a vacuum can that is adjustable. This one is not.