timed vacuum vs manifold vacuum

I checked the specs and that's not a large cam at all. They recommend 901's, a single spring, but even fresh stock spring should not cause a float issue. I'm no dist/ignition expert at all, other then I know adv. curves, i'm from the point dizzy days, but I still think it could be ign related? See what kind of post's you get for a while. Might be someone with the same issue that can help.