cranks and starts but wont keep ruuning

What your saying makes no since no wire for the ignition goes to the starter or fuse panel
two come from ignition switch here's a simplified drawing http://www.mymopar.com/downloads/Dual_Ballast_5pin.pdf
or go to mymopar.com click on tools reference the wiring electrical diagrams run may be a blue wire coming off the switch to ballast (side that has a jumper between two terminals) see if you have any power there with the key on the other side of the ballast start may be a brown wire going to the switch I'm looking at a 74 diagram