im sorry im sure its on here somewhere but cant seem to find it after a few hours of search.
what i want to as is how much can a AU head be ported or if i just need to give it a polish as im building a turbo engine with cp forged, ba spool rods bottom end and a custom crow cam looking at running 500hp and 15-20 psi boost and its going into El Fairmont

Probably start with a eb motor, take the boost better or so I've heard. Since they are lower compression then the ef/el motors

dorry mate should of said im using the au motor and doing the sump chop