I need a little enlightenment on this Holley carb

Top pix: The one port looks like manifold vacuum; probably not used on your '64. Cap it off.

Bottom pix: The large port at the base of the carb is for hooking up the PCV valve line. The small port in the middle is ported vacuum and goes to the vacuum advance diaphragm on the distributor. I believe the large top port is the bowl vent.....not really anything to hook it to on your '64; I would put a small filter on it and leave it open.

All the above assume your '64 is configured as a '64..... but it looks like you have a capped off EGR valve port so you may need to give us some more info on what you have.