Rebirth of Dustbull-with 408ci, efi, t56, dana 60

Got to use our new tig welder for the new 90mm throttle body. That turned out pretty nice. But to put the brakes on my progress i have somehow lost spark to the engine, im getting a signal from the distributor, but no signal to the coil...im getting 12v at the coil with the ignition on, but while cranking it goes down (why i have no idea; i havnt changed anything from last weekend when it actually ran for several seconds.)