Many thanks for your input with specific part numbers techinspector1 !! it is much appreciated !

I see Edelbrock says their performer RPM intake is for "Large oval port" heads.
Mine are 781. I have searched online and see the 781 heads called "oval port" what do they mean by "large oval port" ?

Had a look at the carb and it is a Holley list number 4777-2 which is a 650 CFM carb. While I do want very good low and mid RPM power and torque, I don't want to miss out on a lot of power by sticking to a smaller carb than needed.

Will I be ok with this 650 CFM carb or should I step up to something like a 750 ?