I was involved with a JASPER crate sprint (winged) program at Bridgeport Speedway in NJ a few years back. At the height of popularity we had an average of 28 cars showing up each week to compete. It was an organized club with officers, bylaws, etc. The JASPER powerplants were sealed 350's, all you needed to do was bolt on injection, pumps and race. The engine would turn in the neighborhood of 7500 rpm's and lasted the entire year before they were sent back for refreshing if you were good with maintenance and didn't twist them too much. We got minimal support from the speedway, it was predominantly a modified track, and the club basically fell apart in 5 to 6 years. In my experience, I would say that the #1 priority in a crate class is technical inspection of the powerplants. We all know how racers like to push the rules.............keep the playing field level and your car count will remain high. A racer will come to the track each and every week if he thinks he has a chance to finish well or win.