The 275/40 and the 315/35 are the same diameter and will work very well on the car. It is the set up I am using on my 92.
As moonunit mentioned, check the offsets on the new wheels. The offset for the front (9.5 wheel) should be 56mm. The 11" wheels for the 315 tires would be 36mm if they are from a ZR1 or 50mm if they are "Grand Sport" offset. With the 50mm or GS offset, you can just bolt them on and everything should be fine. If they are ZR1 offset (36mm) they will stick out from under the fenders about 3/4" and you may want to consider adding the GS fender flares to cover them - for legal and other reasons.
Later,