Manifold Vacuum Experiment

Oh I need to come back and add this. While not what I would call a "problem" it has exhibited a rich condition at idle. Stinky exhaust and such, which is indicative of not enough initial timing.....even though I've had it as high as about 25-28 degrees. That just shows that it obviously wants more. The carburetor is only a 650 on a Ford 400 engine, so I hardly think it's too much carburetor. Pretty sure that's timing related. I plan to find out.