[Argess]

I don't have much to offer, but if you can get a Ford P/N from your distributor, I might be able to find the vacuum advance figures at various levels of "in Hg". You need a vacuum pump (Mighty-Vac or equiv), a calculator, calipers, a piece of stiff wire and a Sharpie marker.

Make a pointer with the wire by wrapping it around the rotor button and have it extend to the edge of the distributor. Make a mark on the dist housing where the wire ends. Connect the Mighty-Vac to the vacuum canisiter and apply the vacuum level you want to test. The rotor button will move. Make a new mark. Measure the difference between the marks. The advance is equal to the distance moved divided by the circumference of the housing all multiplied by 360. Circumference is easly determined by measuring the housing diameter and multiplying by Pi (3.14)

As to the Pertronix, best investment I made so far. Replaced the dual point plate with the Pertronix unit and much smoother acceleration.