Changed the heads and intake on my '74 Duster and now that it is all back together I have no spark. The only wires I un-hooked during the head & intake swap were the battery, alternator, starter, and electronic dist. plug. Everything is back together correctly but the car just rolls over and doesn't fire. Everything checked out with a test light except I have no power coming out of the dist. The dist. was un-plugged and used a jumper wire on the plug coming out of the ignition box, when that was done got spark out of the coil wire. I have no spark out of the cap or plug wires.