I am helping a friend tune and do some maintenance on his '66 Belvidere. He runs a solid-cammed 440 with an M1 and a King Demon Carb. He said it's a 900, but I'm guessing it's a 950. He had some issues with the breathers pushing oil. He did not run a PCV valve. I ordered one, but I do not see a vacuum port at the back of the carb to plug into. Does this carb have one? Thank you in advance.

A “king demon” is a 4500 series carb.

They don’t usually have vacuum ports.

You’re there working on the car....... the carb either has a big vacuum port, or it doesn’t.

I guess you could drill and tap the manifold for a vacuum port if you need one.

Dwayne, I'm not there now, but I was last night. I never worked on a Demon. Thought it would have the large bung on back like a Holley, but nothing. Was searching the web, and found a diagram that shows there is one on the series below his. Guess we'll have to port the manifold. Any other way, other than a vacuum pump to get the pressure out of the crankcase?

Good idea. Thank you.

The only way I know of to get rid of excessive crankcase pressure is to find and fix the problem causing the pressure
Bad rings, damaged cylinder walls, damaged pistons and so on