I am still running the cam Bob designed for the Oval ports. The 320's are still stock with 118 cc. I should be around 9.6 compression with these heads as I am running a small dome forged piston. With the oval ports I was around 9.6 compression also. I was thinking the other day that my ported Oval ports might be a better head than these World heads. When we dynoed the motor with the oval ports the jetting was fine on the carb and in the boat it seemed to run a little rich. It seems to still be the same with the World heads on it. I am not real good and carbs and don't really know anyone in the area that would be great at it. How do you know if its seeing a lazy signal? Other than reading plugs what else can be done? On the dyno we used a pyrometer on each header tube.