I figured the static compression to be 10.6 & the Dynamic to be 8.2x, pretty nifty calculator.

http://www.kb-silvolite.com/calc.php?action=comp

75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU