I make in that range with a stock crank 451/400 using Stage VI heads (300 flow), a mopar 590 cam, Indy 440-3 intake and a quick fuel 1050 dominator, however I am at 13:1. It seems like you have to trade cubic inches for compression.

'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119

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