Vacuum advance retro-fit

[maytag]

Mornin' all!

So, I've installed an electronic ignition distributor from my '80 parts car into my '76. It was too late last night by the time I got the new vacuum advance diaphragm unit on the dizzy for me to go poking around much. So a really quick question here:

For those who've done the same (or who know anyway):
Where have y'all pulled vacuum from for the advance unit?

And once I'm all set, how much advance will it give me? Any idea what the curve looks like at WOT? Or? (stock 1800) I'm trying to decide what to start at with my initial timing, so any suggestions that way would be appreciated too. Don't wanna have to re-invent the wheel, I know many of y'all are much smarter 'n me, and have been down this road as well.

Thanks in ADVANCE (tee-hee-hee..... pun intended)

[BEEK]

find a port on the carburator that does not have vacuum at idle, when the throttle is opened then the port has vacuum.
meaning the vacuum is pulled from above the throttle plate.

[majicwrench]

I would try a off-idle port as suggested, but also try a regular full-vacuum port. Some engines like the ported vacuum, some like manifold vacuum, experiment. A little looking should let you know how the '80 was arranged, so that would be a good clue too. I would set timing however the '80 had it, and then perhaps experiment a few degrees from there.
At WOT the vacuum advance does nothing and will not affect the total or the curve.