well he can build aspirated duratec's with over 300bhp so i would say he is good .... well worth the money...

or there is vulcan engines/ ht racing/ grace engine devolopments/ burtons and so on....

but burtons are pricey.... and from grace engine devolopments are proberley the cheapist .... for me its around 500 all in for a fully done out head plus cam choice