HELP! Fires up but doesnt stay running :(

Hope this is an easy one... I have a 1973 Plymouth Duster that I am doing a custom/resto on and I ran across a problem. It starts super easy and fires up but as soon as I let of the igntition it dies. Everything is new from suspension up. Ignition is the Mopar Orange Box, Mopar Distributor and Voltage regulator. Wiring is all Painless. I am wondering if some thing is goofy with the ignition wiring ?