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The letter ratings are speed ratings and indicate the maximum manufacturer's recommended speed given proper load, stability, etc. It goes like this (starting with S since most decent tires for AutoX wouldn't be lower than S):
S = 112mph
T = 118mph
U = 124mph
H = 130mph
V (and Z) = 149mph
W = 168mph
Y = 186mph
But for SCCA you should be more concerned about treadwear ratings. The lower the rating, the stickier the tire and the better it'll handle. The trade-off is that it won't last as long. For instance, the Bridgestone Potenza RE050 has a super low rating of 140AA. Super sticky...short life. By comparison, Bridgestone's all season no-frills passenger car tire has a rating of 700AB. Those'll last forever but'll be hard as a rock. I prefer something like a Kuhmo Ecsta 712. The treadwear ratings are between 280-360 (depending on size and aspect ratio) so they're good enough for a daily driver, too.
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