Go to dandydifferentials.com.au, Georges prices are very good and he does quality work, even just go there to suss out what he thinks. He used to work for G&J diffs but has gone out on his own. I got quoted 1200 changeover from FTG also.
402rwkw with the head lifting has got me stumped then if you guys can make alot more power on 12mm headstuds. Awaiting Brads response to the email I sent today.