According to those rules , you can't use a Mod2 cam , just the CL-1 or 2 , and from the looks of it , you can't really do much to the head either . It has to pass the CC test , which limits your piston and milling the head . No porting or polishing and a stock gasket . Be better off building a small block open IMO , or get a clone . Those rules suck in IMO , LoL
See if they have a Builders Prepared class as well , if you want to build a bigger pony ! Then you can go wild on a build , if that is what you want to do ..