Finally got it running after a new HEI and new carb. It's running with a very high idle and I think maybe I attached the loose vacuum lines incorrectly. I thought I saw a vaccum line diagram on here once but can't seem to find it now. Does anyone have a diagram? 67 vert 326 with a/c, power steering and power front discs. Also there seems to be an open hole next to where the distributor inserts. Am I missing something?
Thanks for any help.

I don't know the answer to your question about the lines but a hole in the intake that is loosing vacuum out of it is not good. Is there suction on it if you place your finger in it while its running? If that drops your idle when you do I would just plug it and go for a cruise

As discussed in another thread that is the pcv valve grommet in the valley pan. Here is a 68 vacuum schematic from Harold B's site, although a little different it should help with the basics. Look in the diagnosis section. https://www.firebird400ho.com/mdocuments-library/ anything specific just ask.

Interesting. I just looked at mine (EB) and there is nothing there on my intake or pan (no hole/connection).

That Harold B website has some great info for sure.

I should of clarified that it's the factory location in the 67 valley pan for the pcv. I wish I could locate the factory vacuum diagrams for the different models and years for the op but don't know where to look.

That info is somewhere out there, my friend. Keep digging.

What is the intake manifold, manufacturer/model?

Looks like an Edelbrock to me but he bought this a/c car not running and with no lines hooked up. Instead of explaining every connection I thought it would be better to show him a vacuum schematic and then answer what he could not figure out. Do you know of an online source for these? I think they were on the first gen site but that is lost.

Another problem is that vacuum lines are very often not needed, or not needed "any longer" so unless you know all the details it is really tough. Many just get capped off. Of course depending on carb you might have more or less. Might be easier to check of the essential list, of which I will forget some i'm sure:

Line to the master cylinder.
PCV
Choke? depends on the system.
Distributor
transmission?

Ones that often get capped:
Line that goes to original air cleaner, to run the heat riser valve.
Choke