[sierra4x4]

D13, The ignition set-up is very easy, all i am doing is gutting a stock 250 HEI dist. (removing the advance spings, weights and module) then tack weld the top so nothing moves(eliminating the mech adv.) after that just run the 2 wires from the pick-up coil to a stock GM TBI ignition module so all timing is computor controlled. don't forget to unhook the vac adv.
Here are a few images on non GM TBI dist conversions but same concept.