I get about 9.9:1 with a KB 400, down the hole .024(stock deck height), .022 gasket and an 84cc head.

The KB 400 is listed as having 6cc effective dome volume.
If the dome and the reliefs were a wash it would be listed as a 0cc dome.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads