which one should i use

#1
today i took the head off my sons honda gx200 to put the 15cc head on and upon removal i seen that this head was cut a ton already to bump the comp.i also noticed the port job in the head was rather large.so my question is which one would benifit this motor more?275cam,billet rod,flywheel,ss valves(stock)chrome molly push rods 26 lbs springs 8 degree timing advance,im looking to get the compression as high as the set up would work best,race fuel no problem,run it in my snocross sleds anyways,any sugg?im kinda trying not to go backwards and i know alot of you on here are way more knowdgeable then me thanks.
 
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