Also, it's unclear if we will be able to alter the initial timing to 18* or more while keeping the total limited to 34-36*; or if the motor even still wants that timing that worked well with the carb.
You have a Magnum engine in yours right? With the Magnum EFI? You've been on the Friday Spring Fling and/or Fall Fling cruises to Malibu? I think I have seen your car, but I might be mistaken.