Looking to purchase new Mopar electronic ignition box

X2 on the HiRev box.
This one Summit Racing SUM-851021 Summit Racing™ Ignition Controllers for Mopar | Summit Racing was also brought up in a recent discussion. Good reviews, but have not tried one myself yet.
Interesting Summit Ignition Box
The old Standard Motor Products LX101 boxes (not to be confused with the newer outsourced LX101T) were a good, low cost box with no built-in rev limit. Much better and more reliable than the China-sourced orange boxes being sold now. You can still find them reasonably on EBay.
And there's nothing wrong with your old analog MSD box, if it's still sound. Back when MSD was still good.