which kbs???

A KB107 will be high in number, but because of the heat transfer rate of aluminum, it acts like it's a 1 point down ratio. Thats why the Edelbrock heads are 65 cc's.

A 9.8-1 ratio can be obtained with the KB107 and a 72 cc head (J, X etc... ) and .039 gasket.
If you used this combo but with Edel. heads, it will run better, cleaner with less advance.

Been there done that still have the T-shrit and parts.