Initial timing

Rag,
For MVA, the VA unit can be connected to ANY port or position below the t/blades, except the PCV line.
You can Tee into the brake booster line or any line that might operate off engine vacuum such as air vents, h'light doors, etc.

Probably the easiest is in post #17 pic. See the rubber tube on the left side of the pic, goes to choke pull off. You can tee into that.