2006 SCTA rulebook, page 214: Nate Jones Tire Company, 1837 Reservoir Drive, Signal Hill, CA 90755. 562 597 3369.
He'll ask you where you'll be racing and how fast you plan to go. With that information he'll know how much to shave and how to contour the tread surface. If you'd like he can supply you with recommendations on which tire to use, and he can supply the tires, too.
His shop will shave, mount, balance, and even nitrogen fill the tires if you wish. He'll respond to your questions about tread depth and pressure.
He'll ship the tires to you -- or will have some racer deliver them to you on the Salt if time is of the essence. He'll likely visit you on the Salt and ask how the tires are working for you.
When you are in inspection and the inspector asks about your tires -- if you state "I got my tire from Nate Jones" you'll almost immediately get a "pass" -- that's the respect his shop has earned.
I've learned each of these tidbits from experience with him. And, as is implied above -- he supports our sport with product and by advertising in the rulebook. Consider giving him a call.