? About mopar/MSD Distributors. Riseing or falling Edge??

I'm not familiar with MSD but here's the deal. If you are using a magnetic distributor, and reverse the pickup wires "incorrectly" it will offset rotor phasing, and cause rough running, etc. Same deal if you are using a Mopar dist to trigger an GM HEI module.

Do a Google search "rotor phasing" and you'll get lots of info