Carburetor suggestions for 318

I've got a 71 with the factory 318. I'm running KB high compression pistons with mid 80's 1.60"/1.88" heads. It has the xe268h comp cam.

I currently have an edelbrock 1406 600CFM carburetor with an edelbrock performer intake on the car. I'm not 100% impressed with the performance of the carb, I was wondering what you guys would recommend? Could I go larger? Is there a better application out there for me? The car is mainly a driver, I like to get on it from time to time, but i just want something thats good for the road, I'm not concerned with gas mileage.

I bought the carburetor new, and it only has maybe 1000 miles on it.

Thanks for the help guys!!