the exhaust port may be raised some
the valves are .400" longer
280 cc intake port
100 cc exhaust port
75 cc chamber
dual quench chamber
2.20" intake vlave
1.81 exhaust valve
the exhaust flange is .125 wide then the standard Edelbrock head, which is already .125" wide than a factory head.
the intake rockers will be offset .485"

flow
I 330 cfm at .600"
E 235 cfm at .600"