Advancing Cam Question

Average cc chamber volume: 64.6
Bore: 4.030
Dome cc: -1.2
Gasket: .040 (estimate, was .057 before install)
Gasket bore diameter: 4.125 (scaled)
Deck: .018 (below)

Compression ratio (Wallace): 10.9:1

Looks like I lied. I think when I figured it before, I used the smallest chamber. It's been a few years, and my notes ain't perfect. (Darn, 11.1:1 sounds cooler.)