Nate Jones Cowboy Tire is in Signal Hill, CA. 562 597 3369
Nate is about as experienced and knowledgeable about race tires as you'll find. Yes, he's on the other side of the country, but I've shipped wheels to him to get tires installed, shaved, balanced, and delivered to me in my pit during SpeedWeek a while back. Maybe he can offer someone closer to you, too. His company info/ad is in the rulebook.
And he's the only guy you'll talk to these days that has the keys to a WWII battleship.