I've toyed with doing the same type of thing.
I've raced Mustangs since 1990 with SCCA and NASA.
www.rheacermotorsports.com
Look under Tirerack.com. Go to Products, then tires, then Kumho, Hoosier, Yokohama, and BFGoodrich (interesting the BFG T/A tire was a sponsor of TransAm, but didn't have a tire for the series till the late 90's) I used Kumho's back in the early 90's and BFG R-1 before that. I use Hoosier now, as I get a deal on them. I use slicks on my current car, but the A-6 or R-6 are great "Race" compoung tires. Not for day to day use, and kinda pricey.
R-6 will last a bit longer than A-6's on road courses.
If you want a daily driver tire, the Kumho MX is good choice and still decent on the track.
Good luck with a 295 15. To keep the look of the era, 275 should be more than wide enough.