So after talking to Larry/MadScientist/Conv67bdere a bit more about "de-humping" my outer wheel well I went back to the shop, put one of the rear tire/rims on a floor jack and lifted it up into the new wheel well. I actually believe the tire would fit without the "de-humping" but it would be awfully close and I don't think I'd be comfortable with it so I sat there for about 30 minutes, making lots of Vroom Vroom noises, and tried to develop a plan.
I decided if I cut out the offending part of the wheel well and slid it outward about 1 1/2" I would have WAY more room than I would ever need, so below are some pix with the layout lines:
Once I had the section cut out I found the rear did not need to be moved outward nearly as much as the front, which will make re-assembly much easier . Why? The rear has a bunch of contouring that would be really difficult to blend but since I don't have to move the rear out much I'll be able to blend the patch back in much easier. The pix below show the patch sitting in place and I think you'll get a much better idea of what I'm talking about:
Notice how tight the gap is between the patch and the wheel well; that area has a bunch of contouring that will blend together pretty easily since the two surfaces are so close to their original positions.
You can see how much larger the gap at the front of the wheel well is, but this section will be filled with sheet metal with little or no problem.
Now comes the exciting part; fitting the tire/rim into the wheel well, and as you'll see, there are definitely no clearance issues even with 335/17's! WooooHoooo, another problem solved!
As soon as I can get out of the office I'm heading back to the shop to start filling the gaps, so more pix to follow.