Can't get it to idle

[Ackattack]

I've been tinking with my 69 pickup, but I can't get it to idle.

I tore the engine down, put all new gaskets in it everywhere, and put it all back together.

I'm running an edelbrock 600 manual choke carb that I recently rebuilt. I also have an HEI distributor that I also recently went through. New plugs and wires.

I can get it to stay running about 1400 RPMs, if I dial the idle speed screw down or open the choke, it will die. I played around with the timing (can't really set it, since it won't idle low enough to really set it).

I screwed the idle set screws all the way down, and then backed them off 1-1/2 turns, and then a little bit more playing around with them.

I was thinking vacuum leak, but I can't feel anything. Anyone got a good way to check for vacuum leaks?

Any other suggestions? I feel like if I put a new carb on it, it would work fine, but that's a lot of money for a hunch.