I have a '71 Chevy C10 with a 383 that I just freshened up. I ditched the HEI and went with a MSD Pro-Billet Dist. (mechanical advance, magnetic pickup), MSD 6A box, and MSD coil. I am not getting any spark right now. I have verified the wiring more than once and did the test that they say in the trouble shooting section. Does anyone have any ideas?