mission complete, 285s up front on my Dart

Awesome! Lots of math and measuring I'm sure!

What suspension are you running up front? I'm curious how much wider your track width is compared to stock and what turning radius changes may have occurred if any. I run 18x9's with 275/35/18's on my Duster (Demon tribute so Dart fenders), and even with a wider track with (13" Dr. diff brakes and a 3mm spacer) the 6.3" backspace rims I have put the tires right up to the frame at full lock, no extra clearance there. That's with 6.1" of effective backspace compared to a stock 73+ disk brake set up. But I know that the steering stops aren't the same length on different brands of lower ball joints even, so there's some small changes to turning radius even with "stock" parts from car to car.