I'm another one all for neo head onto stock rb30 bottom End but that's not in the rules!
Isn't the obvious choice a neo head onto pre neo rb25 bottom end?
Plenty more comp instantly, no need for machining anything. Just a different plug on vct and swap cas wires and boost away.
So anyone with a nice running 25 non neo, whack a neo head on, run e85 and report back with tales of winning.