There are new heads available as pennyman has previously posted. They are typically 'bare' so you will need to source valvetrain hardware. Here's a bargain bare head - http://au.dhgate.com/product/petrol-...iABEgJTUPD_BwE

Give it a light port job and match it up to you inlet manifold, polish up the combustion chambers, add springs, valves, rockers, rails and cam and it'll run better than new.