I ran them on my Rotus, but that was not a typical seven. Ran magnesium wheels. 265 17's in the front, 295 18's in the back.
I wouldn't recommend it. A lot of unsprung weight on a light car. I had excellent grip on smooth surfaces which was fine with me since mountain roads around here are generally very smooth, but having driven a few other sevens and gotten a ride in a couple, the car was not as settled on bumpy surfaces.