Built a 340 4 speed and put it in a 80 d100 stepside. Using a 6A #6200 box. I first used a blaster 2 coil and a mallory unilte distributor. No fire. Did the test coil seemed weak. Installed a different coil still no fire. got the son's msd dist. from his 360. Redid the wiring for the msd setup. still no fire. I left the ballast and stock module hooked up. What am i missing.