440 help needed

Well it looks like I am going to do a cranking compression test on it to see where it is at. Then I am going to pull one head and do a cc check followed by measuring how far the piston is down the hole. Since I know the domes are 12.1cc and the gasket is .039 I can get really close on the actual compression ratio. I actually started and drove it around on 93 octane in my other Duster and it ran great but I never opened it up. I am positive it would have rattled pretty hard. I just want an 11 second street car and if that can be done with 10:1 then great. If this motor turns out to be zero-decked then I guess I need some BIG chambered heads.