Tire size change??

Right now I'm looking at changing to 275/40 17 in the front and 275/40 18 in the rear.
Opinions?
The front 17" wheel is measuring out at about 10.5" overall but I'm not sure if that equates to a 9" wide wheel.
On the rear, I know that 275/35-18 matches the stock height of 275/40-17. I'm just wondering if the stock wheel well can fit 275/40-18 so I can get an extra 1" of tire height.
-Up front I have a 17x9.5 Corvette Replica wheel with +56 offset.
-Just ordered a pair of 275/40 17 BFG Comp 2 A/S tires yesterday.
-Out back I have the same style Corvette wheel but it's a 18x9.5 with 56 offset.
-BFG makes the same tire I just ordered in 275/35-18 and 275/40-18.
-Will the 275/40-18 fit the Firebird wheel well with this size wheel? I would rather go with the taller tire.
After going through a bunch of decisions, I ended up buying a set of tires for my crappy American Racing 16" wheels. Wasn't happy with how that all turned out but I guess I have a cheap set of all-season Yokohama's for my car now.


