MV8,
Using Manifold Connected Vac Adv [ MVA ] is not normal?? Maybe in your world.......but not in others. GM used MVA on
production cars until 1967/8, when emissions forced the use of useless PVA.
Chrys also used MVA throughout the 1970s. When engine temps got too high, a temp switch switched from PVA to MVA; idle rpm increased, which increased water pump & fan speed to cool the engine. MVA does this because it is more efficient.
More on MVA; scroll down to post #6.
www.hotrodders.com/forum/vacuum-advance-hooked-up-directly-manifold-bad-47495.html