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I don't know about your car specifically, but generally if there is no electronic timing controls on your car, there should be some kind of weight/spring set-up for mechanical advance. The vacuum advance is for cruising fuel economy. You don't need it for power, so if economy isn't important to you, forget about it. The orifice needs to be in the carb immediately above the throttle plate when it is fully closed. There is no signal at idle to the dizzy. As the butterfly opens it moves above the orifice delivering a vacuum signal to the dizzy and advancing it for off idle cruise economy. Then as the throttle opens more, the vacuum signal falls away to nothing at WOT and the dizzy relies solely on the mechanical curve for timing. I cannot imagine how you would get the proper signal if the carb does not come with the port in the correct location. It "may" work if you plumb into the manifold but your advance would shoot up at idle and you would have to compensate idle engine rpm. This may also make it harder for the engine to idle back down when off throttle, but I'm not sure. If you have a timing light, you can check the mechanical advance curve easily enough. Hopefully, someone here has direct experience with your engine.
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Bob Raby
Santa Cruz, CA
'88 Alltrac (broken) FOR SALE
'87 4x4 Toy Truck SOLD
'90 4Runner (3.4 swap, CA certified legal with K&N intake, modified thermal coated headers, 2.5" exhaust, and almost as fast as a stock 3rd gen  ) SOLD
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