Back in the day I ran a stock 440SP motor with the CC.650/290@.050 SFT cam at approx 9.8:1, CP was only around 150psi, not ideal yes but it ran real sweet, ticked over@900rpm but only made 490flyhp on the track, weight/mph, mainly cos of the poor intake/small 850DP carb, not good enough 906's (255cfm) and of course the horrible weight of the bottom end, (2000gms per hole), still managed 10.6's with it....was planning to go to 12.5:1 pistons but it never happened.