Nice Cutlass Rooster, the clean-up made a nice difference. My car ('86 Cutlass) has 2-1/2" with the Delta Flow 40s and they're offset. But I'm running pipes out to the rear, coming out behind the rear tires, and a double-hump crossmember. Honestly, your style / need may be different since you're coming out the side & retaining the stock member. If you can get the car up on ramps / stands or even a lift, you can layout the exhaust before you buy. You can make mock-up mufflers out of card-board & tape, use PVC, rolled paper, paper towel rolls or whatever for your pipe. It may sound goofed, but it's really not a lot of work and you can get an idea of routing, clearances, hanger locales...
Anyway, good luck, keep the pics coming and thanks for saving another G-Body.