Man am I envious
! My Lima doesn't get the great numbers your Duratech does but I am following your progress for new ideas. I would love to switch to the same front bumper you have. More plastic, less metal and covers the front wheels better. And a nice lip to add an air dam to. I don't think the bumper mounts are a direct swap for a '97 though.
Check
Car-Part.com--Used Auto Parts Market for a 3:45 rear end. It searches boat loads of JY's and other places for used parts. You can search by region too. The pre-1992 3:45's are 1" shorter on each side moving the rear tires in slightly and maybe allowing more room for rear wheel skirts. I am looking for the same thing.
Nice job all around!