How in the world did a very simple question (arriving at peak timing using manifold vacuum) turn into a total ignition theory discussion?
You can operate a fully mechanical distributor on the street. FORD offered it for years. The only true benefit of vacuum advance is fuel economy, street-ability and emission requirements.
How the advance curve is set up is how street-able the car will be. A SATURDAY NIGHT SPECIAL, not that big of a deal.
Here is the correct answer to the OP's question -
Quote:
Originally Posted by Ole Don
For timing, use manifold vacuum, under the throttle plate. Advance the timing to the maximum steady vacuum, then back off just a bit, maybe 1/2 inch of vacuum. Tighten down the dizzy and test drive it. During the test, lug the engine just a bit and listen for ping. If no ping, you are finished. If it pings, back it off just a bit more.
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Add no run-off after engine shut-down and you have it.
... sheesh ...