[SuperHart]

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).


Your power brake vacuum line also is plumbed into manifold vacuum. You may connect the power brake hose either to the large hose nipple on the rear of the carburetor base plate. If you use a TEE fitting you can also use the large port for your PCV valve. Or you can use a hose nipple screwed into one of the threaded female ports in the intake manifold to supply vacuum to the power brake unit.

The gray taped threaded port on the intake manifold is indeed used for the coolant temp sensor OR the 5/8" return hose from the heater core. Usually there are two threaded ports into the coolant passage, one for the temp sensor and the other for the heater hose.