Recommended 4bbl carb for stock 318

I have an Edelbrock LD4B intake and an Edelbrock 1406, 600 c.f.m., carburetor on my completely stock (except for the MP Electronic Ignition & SummitRacing double-roller timing chain/gears) 116,000 miles 318 (auto with 3.23:1 sure-grip 8 3/4").
And I bet it runs great and get's decent mileage.