17x10.5...on a fox??

Greetings all, I recently read an article in 5.0 about putting 17x10 pony rims with 315 /35/17 on thier 86 project car, I would like to put a set of deep 17 in bullet rims on my 89 (already have 5 lug convert) with a 295/40/17 (little more room than the 315) but they are 10.5 wide. I know the fender will need to be rolled and the inner wheel well "massaged" to provide clearance, but will that extra .5 of an inch scrap the project?

check the article if you haven't seen it: Fox Mustang Wheels - '86 T-Top Coupe Big 'n' Littles - 5.0 Mustang & Super Fords Magazine

Thank you.