As Eric noted, check out the Championship Enduro Series (CES), DART Kart Club, KART, and the World Karting Assoc. All are, or have road race series.
We road race with WKA and the Woodbridge Kart Club, so we’re a bit further East. But it might be worth checking with CPI (Phil Davis, Pa.) or Fisher Racing Engines (Brian Fisher, Tx.) for chassis’ and motors.
As Eric also stated, Stock Honda’s are very popular in some areas, but the KZ (ICC) engines are getting a little more popular here in the East.