The nice thing about "no spark" coming out of the coil wire, after you've replaced the coil a couple of times, is that it absolutely, positively has to be a limited number of issues. Either the MSD box is not getting turned on, or it is broken, or the distributor pickup is not sending the signal to collapse the coil's field, or the wires have crappy connections. That's it. It's got to be one of those.
You're using the violet magnetic pick up wires, correct? Do you have the white wire going to a kill switch or just taped off? If that white wire is just stuffed some where that it can brush up against a ground, it will kill your engine.