For the price of 4 new winter tires, and some wheels to mount them, you could buy yourself a cheap awd subaru. And It would save your mustang too.. They don't like the salt/sand.
1986 GT with the typical poor boy mods. 3.73s, Hurst short throw, King Cobra Clutch with aluminum quadrant, lowered two inches on Eibach springs, Hopefully adding some heads and a decent intake soon!