The AFR 165's are available with either a 58 cc chamber or 64 cc. Also, you can choose between stud mount or pedestal mount rockers. The initial price is higher than some of the other aftermarket aluminum heads, but considering the CNC work already done on the AFR's might justify the higher price. Check out their website at:
www.airflowresearch.com
BTW: I plan on getting the AFR 165's with the 58 cc chambers and pedestal mount, since I already have the 1.7 bolt down rockers. I guess the 58 cc chambers will yield around 9.5:1 on a stock shortblock.