318 Build

65 cc head
.039 X 4.1 head gasket
zero deck piston w/5cc valve reliefs equal a 9.31 ratio.

The little domed KB's would be what he's after for this I think unless theres a head milling involved with the flat tops.

At 9.3-1 it is a little light on the CR, but doable.
Lots-o-verter & gear!