Stock rebuilt 312 with what looks like a Holley 4150 or 4160 carb. It has a large vacuum port on the passenger side rear that goes directly to the intake manifold (via hose), not a PCV valve.

Never liked the carb...changing it to a Edelbrock 1406 with electric choke.

Question? The large vacuum port going to the intake manifold from the Holley, what does that do? Do I need to hook that up to the front of the Edlbrock carb where you would normally hook up the PCV valve line?

I was told by Edelbrock (who admittantly ws not familiar with the Holley set up) that the line going to the intake may be what controls the vacuum secondaries on the Holley and that the front vacuum port on the Edelbrock can just be plugged if no PCV valve is used.

Thanks for the help with what may be a simple question.

Dave