Carb selection help, please ?

I don't claim to be an expert on this, but I'll tell you my experience. I have a built 360 in my '62 Valiant with "J" heads and 10.5:1 compression. I started out with an Edelbrock Performer RPM square-bore manifold and a Barry Grant Speed Demon 670 CFM (square-bore) carb. I didn't like the way it ran. Then I switched over to an Edelbrock Performer spread-bore manifold and a ThermoQuad off an Olds "W" car (I don't know the CFM rating of that carburetor). I like the way it runs with the spread-bore manifold and carb a lot better than the square-bore. IMHO, there was a reason why the factory equipped these cars with spread-bore: that's what they were designed for.