We don’t have a lot of experience with these vehicles but they have a decent community providing tools for tuning the factory ECMs.  Many of the ECMs can directly use 28 pin EPROMs like the SST27SF512 and BURN2 we sell and an Ostrich 2.0 for live tuning.  Other ECMs use 87C257 chips which require a “latch board” to use standard 28 pin chips like a SST27SF512 or 27C256 (or an Ostrich).  These latch boards are available from Meyer Tuned.  The Turbo Mopar EFI Tuning Forum is a good place to start for more information on tuning these vehicles.