I can see both sides on the solid OE looking head. Would it be labeled by clubs as "cheater head"? I'm on the fence as what to think about it. Also, if I remember right alot of classes require full operational cooling systems.
Would a externally remachined, spray welded, intake cut off version of your current head be any more or less legal than a solid OE looking head?
Personally, If your head had a fuel filter base, and the fan drive mounting bosses on the front, (basically direct bolt on for any application, thus making it true OEM replacement) It should be legal for anything.