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THEN......in another place I read this:
This is a subject that has been reviewed many times. First, the vacuum advance module on the distributor should be attached to the small hose nipple in the base plate of the carburetor so as to pull manifold vacuum thus giving full vacuum distributor advance at idle. The reason it's done this way is to make for a cooler running smoother idling street use motor. Connecting the distributor vacuum advance module to "timed" vacuum (the small hose nipple usually located on the side of the Holley primary metering block) would just add vacuum advance to centrifugal advance as engine speed increases and end up with too much total advance (confusing, ain't it).
So I guess I was right the first time. I'll plug off the one on the side of the metering block.
This is a subject that has been reviewed many times. First, the vacuum advance module on the distributor should be attached to the small hose nipple in the base plate of the carburetor so as to pull manifold vacuum thus giving full vacuum distributor advance at idle. The reason it's done this way is to make for a cooler running smoother idling street use motor. Connecting the distributor vacuum advance module to "timed" vacuum (the small hose nipple usually located on the side of the Holley primary metering block) would just add vacuum advance to centrifugal advance as engine speed increases and end up with too much total advance (confusing, ain't it).
So I guess I was right the first time. I'll plug off the one on the side of the metering block.