interesting...all new stuff with power at the coil and no spark

I have had an electrical problem that has been worsening over the last few months. I found the best friendly and technical responses from this site so I’ve come to you guys. I own a 1987 d150 with a 5.2 v8 and what started out as a misfire has become a, “won’t start.” Over the last month I’ve installed plugs, wires, voltage regulator, coil, alternator, a new pick up coil in the distributor (gapped at 8), the actual coil before the distributor, a battery, in line fuses (just after the battery) and I’m not sure what else. I have spare parts from another working truck that I had substituted before I decided to install new stuff and still the problem has beaten me. There isn’t a vacuum line on the distributor, no balist resistor, no electronic ignition…..there are two small metal boxes on the driver front fender (relays?) and I’m not sure if they’re the problem or not….I only have one that’s a spare. There is power to the coil. Around twelve volts on the positive side and a small drop to the negative….its only a week old and I have two others and they are’nt giving spark either. I haven’t found corroded harness connections either. The little black box under the driver side fender is the only item I haven’t replaced that I can think of. I have the Haynes manual in front of me and I’m still not seeing it. It completely quit today after I put the rebuilt distributor, plugs, wires, cap and rotor on. Any ideas?