Truck won't stay running

[Squareforceone]

I replace the carb and intake on my 350 with an edelbrock performer rpm intake and a BRAND NEW street demon carb. Now I can't get the truck to run. It'll fire and start if you keep revving it it'll stay running but as soon as you let off it'll die. It's not the choke or anything like that. I thought maybe there was a vacuum leak. I don't know where it could be. All the vacuum ports on the carb are plugged. I have the vaccum advance unhooked and the ports sealed off. I just can't figure it out. Im not sure of the timing right now i thought maybe it was 180 out so I pulled the distributor out and reinstalled it. I've tried turning the distributor all over the place.