DARN Dart front wheelwells!

I just had the bushings and joints in the front end of the Arizona Dart replaced, and a disk brake kit installed. The brake kit specifies 15" wheels to clear the calipers. The 235/60/15 that my mechanic had on hand hit the lowest part of the front wheelwells.

The tire comparison program I used tells me that 205/60/15s give me slightly over an inch and a half less radius than what's on hand. That really seems like it should be enough, but does anyone know for sure? Thanks!

ATB

BC