Every street engine will benefit from properly set up vacuum advance using non-ported manifold vacuum. Smoother, cleaner idle, better mileage, cooler running, longer life. You can plug it for racing. Drag race only engines should not have it.
I'm not saying nobody gets their car to run good on the street without vacuum advance, but you can make it run better and more efficiently at part throttle with it. Most of the time on the street is part throttle.
I am working on a 440 six pack with with the Promax metering block. It does not have the fitting in the metering block for the normal vacuum line for the distributor. Now that port on a stock metering block is ported, correct? Meaning it does not get vacuum at idle but at throttle, correct? So, I should run the vacuum line straight to manifold vacuum, right. I read on one of the Corvette forums and they were saying the first Tri powers had the vacuum advance straight to the manifold vacuum.
