Any reason you went to steel fenders instead of composite? You've already done a decent amount and seemed like you were going to do it before to replace the old ones.
And I hope by having obd1 stuff to figure out you meant you had to convert your harness to work with the obd2 motor.
Especially since this:http://www.r3vlimited.com/board/showthread.php?t=230879
Plus the higher resolution of fuel/timing maps because of the more powerful DME and the ability to more easily tune/pull codes.