Re: mc2100 install, black smoke when I punch it?
Could be overall rich, not just acceleration. The black smoke / carbon collects in the exhaust system, when you punch it it blows all the junk out. Start with the accel pump notches first tho.
The popping backfire with the MSD coil - that coil no doubt needs full 12 volts to it -- the stock module uses an ignition resistor - limiting applied voltage to around 7-9v.
You are running out of available secondary voltage.
To test that, hot wire a jumper wire from battery (+12) to the (+) side of the coil. If the problem goes away, that's it.
You can eliminate the stock ignition resistor but the module will overheat and fail eventually.
Best way go to the remote HEI module, or an MSD system.
Also make sure the plug wires don't run parallel for much more than 6" or so -- pretty looks good but doesn't work - too much cross induction. Ugly works fine.