Yeah the rules differ from classes a lot.
My pops runs a NHRA Super-Comp dragster.
His rules are just outrageous. If your only running in the 12's I would just stick to outlaw tracks and go have fun.
You know tracks where all what you need is a state driver license and if you run under a certain ET they will prolly require a helmet.
But yeah like for my pops car. The rules are crazy, roll cage must meet specificed diamiter overall, must be so thick on the walls of the tube, so much space inside the tubes, blower has to use like 12 point hex bolts, has to be belted in, blast shields, shut off switches, no rubber lines of any kind, must be all steel braided, blow off valves for the intake, just to start naming a few. This doesn't even get into the driver qualifications, that all entails your ability to control the vehicle, shut the vehicle down with both eyes closed, physical's...
Most tracks don't even require NHRA licenses if your not running under 10 seconds.