I have a set of stage 3 576 heads that was done by hughesengines.com the heads i brought new and sent them to hughes and after the work was done the bill came to $2100. 2.055 x 1.625 valve springs go to 700 lift, heads flow 296@650 lift. selling dirt cheap. $900 plus shipping selling because i need to the money to pick up my W8 motor from the dyno next month