msd or mopar hei ?

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.