Barracuda not starting after being parked for five years

May I offer a suggestion. The battery/resistor comments are likeliest options. Since you have the MSD coil, for about $200 more via Amazon you can upgrade the whole mess and get an MSD box. It will throw as many volts and amps as the ignition will ever need and it will do so flawlessly. As I am sure all of us will attest, the Chrysler ignition systems leave a lot to be desired. You can run one significant wire from your fuse panel to the MSD box and then one significant gauge wire directly to the coil. You can then throw away the miles of 18-20 gauge wire the factory installed withe steps in between the ignition, resistor, HEI module, distributor and coil that probably have splices in a few places as well. One 14 gauge wire, MSD box to coil to distributor. One 14 gauge wire, ignition switch or fuse panel to the box. The result is an engine that doesn't crank for multiple turns. You hit the key and starter button and after 1/2-3/4 of a crank, the engine ignites and sounds like a bad *** Mopar. Did this in my 440 Duster transplant. I found more than 5 tape/twist splices between ignition module and distributor. No question as to why I couldn't get the engine to stop misfiring and puking on itself.