22-24" 12-14 extremes with a +6-+8 arm and wheelie bar would be a good start. I have a set of 10 paddle extreme 71-72" roll out on my +8 alky dragger. I have some 24" 14 & 16 extremes for my big bike I'm going to try on the zilla and see how they work.
Leerjack is in Patterson, Mo. There are a few other places over up by STL like Bonne Terre and St. Joe Park. And Thunder Valley in Grain Valley Mo.
I'm moving back to Missouri in a few weeks. Thunder Valley will be my new track. Oct 18 & 19 is their last races of the year. They have sand rail dragsters that run the track also.