truck fires but wont idle

[VOoDoO70]

The trucks been sitting awhile for close to a year, truck will crank over but wont idle and Im stumped. Heres the setup 1970 C10 sbc( not stock) with an electric external fuel pump mounted on the frame, coming from an in cab tank, to a 600 Edelbrock carb. No fuel pressure regulator. When I turn the ignition the fuel pump starts humming and shows 6.5 psi on the gauge in the fuel line, then I crank it fires right up but you have to keep your foot tapping the pedal to keep it running. I noticed the fuel filter by the carb does not fill up. As I mentioned the truck has sat for awhile but I since then have replaced the carb with a brand new one, and drained out all the old fuel from the entire fuel system. I even blew the metal line and fuel pump with compressed air. I feel like Im missing something, but dont know what else to look for. This is my current fuel system. Any imput?