Atco has a great index series. They run 8.50 10.00 and 12.00. You can count on 30 or more cars for each class,the payouts are pretty good,pro tree,top 16 qualify pro ladder.10.00 class is dot tire 13" max, no tube cars, with 1 power adder. Its become very popular and now e town has been running 8.50 10.00 and 11.00 classes with similar rules. There's also points earned at every race.we run 10.00 with my brothers nova and do pretty well considering we don't make all the races. They usually run thursday nights with the 1st and last race combined with outlaw 10.5. 8.50 and quick 8 on sunday. Good show and its always a lot of spectators.