IMO, a 275/50-15 at 25.7" is too short for the car, and too wide for an 8" rim. But many people have run them.
A 7" rim in the front is too wide for a skinny look, but you could go for height instead. A 275/60-15, which is 28" tall would work. But the rim offset would have to be ideal, and the speedo would read too low.
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles