I have a 1980 Datsun 720 4x4 that came stock with the ei matchbox dizzy. I sent the dizzy to be rebuilt by the guys through rock auto. They returned it stating that it is un-rebuildable. I have a hot spark HIT4 dizzy, which I installed with the proper coil, new plugs and plug wires. I am getting spark to the dizzy, but no spark from dizzy to plugs. Do I need to install a gm hei remote ignition module to make it work? Please help, I have been trying to remedy this situation for over a year. Needless to say I am losing my patience.