msd or mopar hei ?

adriver said

Keep it “stock” and carry a spare. (Or at least know that you can get one).
I got stranded with an MSD. It was in heat/intermittent problem.
MSD did send me a replacement.
But since I already had the money invested, I wired a Chrysler box in for back up with a terminal strip if I need to change the wires over because the MSD acted up.
Once bitten, twice shy.

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I have the Accel 300+ ignition on my ride and I tried to wire in the Chrysler box as a back up but the car wouldn't run on it but run on the performance box. I still would like to set up a back up because that would beat the heck out of being stranded. I could buy another Accel box just for a spare but that would easily be over $200 for sure. I would like to know how you wired yours up please. I ran a switch to the boxes to cut one off and then cut the other on but it did not work. I hooked both boxes to the distributer wires and I think this where the problem was. The Chrysler box would not receive the distributer but the performance box would. ??? I hope you understand what I'm talking about. What do you mean by terminal strip? I think I do but not sure.