Bobby, I'm using Super Pro 45 x 37.5. Chambers are flycut to 58cc. The cam and rockers(and dynamic compression ratio) I've chosen will work great with this combo. Webcam 86b has gradual ramps to work with 1.4 or 1.5 ratio rockers. The Berg rockers are 1.45:1, lift is 0.551" at the valve. The math works out and was also verified physically with a dial indicator on the valve retainer. Static CR is set to 9.8:1. Also using CBs port-matched CNC manifolds. CNC porting ensures every cylinder has the exact same flow. Every part matters from carb all the way to the tailpipe, all must be chosen to work together.
What I'm saying is if you want to change the heads on your motor you may need to do more than just change the heads. A cam, lifter, rocker, and pushrod change may be needed along with a serious look at carbs and exhaust, and yes transmission gearing.
This motor will be running Spanish Weber 44 IDFs. No idea what jets it will want. Yet.