I believe #16,#48,#62 heads all have 72 cc chambers and should give you approx. 9.2 cr. they all have 2.11 intakes and 1.77 exhausts. According to SD performance you don't want quite as much compression in a pump gas pontiac engine as you could get away with in a small block. Like Mushroombert says you can go to a zero deck height, increase your cr a little and get a more efficient burn and come closer to the compression your looking for. Add .5 compression ratio if you go to aluminum heads to achieve the same results. I've seen these heads selling on CL and KIJJIJI for $50- $200. SD performance sels them complete CNC ported to 240cfm, springs etc of your choice for $1500. Read Jim Hands book "Max Performance Pontiac V8s". Lots on efficient horsepower. Once you go pontiac you won't go back.