could someone tell where the vaccum ports to the carb hook up to. its a holley 4bbl 650 the a short metal tube on the opposite side of the throttle linkage thats sucking air, i put my finger over it and the engine runs a lot smoother so for right now i just have that line plugged but i have the feeling that it goes to something.

 

the only one you need to worry about is vacuum advance. RH side of metering block. Any others, cap them.