SBC, Mallory Unilite, Generic Coil, Generic Ballast Resistor, Generic Wires. Engine ran fine with that combination, had a slight miss, but has been wired & running this way for years with no issues. Decided to upgrade the Coil/Resistor/Plug Wires Got a new Mallory Chrome Canister Coil, Mallory Ballast Resistor, Accel Spiral Core Wires. I pulled the truck into the shop and swapped the plug wires, swapped the coil and the ballast resistor. No changes were made other than directly replacing these parts. I started the truck up, it ran for a split second. Since I didn't blip the throttle, it died. I tried to start it back up and now it just cranks like its not getting spark. Coil is showing 6.51 volts at (+)POS with Ignition ON and 6.53 volts at (-)NEG. What the hell?