Lowering Springs and Tire Sizing

[aft3rsh0ck]

I know there are tons of threads online. I cant seem to get a simple answer.
I have a 1986 Grand Prix with factory 7.5 inch rear

I bought 15x8 corvette rallys with 4 inch BS.
My drop is about 2 or 3 inches in the rear...Pictured below
Will 275/60/15 mt et streets fit under my fender lip? If not whats the widest tire I can go?

Thanks guys!

 

[Tater84]

my car wasn't lowered and i had little to no more room for any bigger than 275/50/15 M/T's et streets chances are you will need 255/60/15 but there's alot of guys here that know more than I do. Maybe had I lowered my car I would have had to roll the fenders no way i was going to do that