I currently am running Bridgestone Potenza RE760 Sport tires, 245/45/17 all around on my 1991 5.0L Mustang.

Current tires went on in 2010, been on the car since then, with about 30,000km on them and stored on the car in the garage. Tires still look excellent and still has deep tread grooves.
However, I'm wondering if the compound is starting to get hard now and thinking it may be time to replace them.
The wheels are 03/04 Mustang GT five spoke 17" x 8" rims all around


My fox July 2015.jpg
Like to use it for cruising, and hopefully some track days. Car has full Maximum Motorsports/Ford Racing suspension, Bilstein shocks, Cobra Brakes, etc...
Might get caught in the rain so I don't want dry weather only tires.

Suggestions on similar quality/performance tire to replace them with. Apparently Bridgestone is just now discontinuing that particular tire.

Thoughts? Suggestions on where to buy?