Best 4bbl

Best carb? Whatever I already own, sitting on the shelf. Holley/Eddy... 600/750, doesn't matter. Within reason, on the street, a 600 will run well on anything from a 273 to a 360, a 750 will get you up to a 440... and everything in between. Holley or Carter/Edelbrock, everyone can make a case for their favorite; but that's all they are is a favorite- they both can work equally well as street carbs. As said, it's all in the tuning. If you put a gun to my head and made me pick one for you, I'd say an Eddy 650 AVS2. Will work well on a stockish or warmed up 318, and is still good for a 360 build if you decide to go that direction sometime in the future. Personal favorite would be an old Carter 625 Comp. Series AFB, but I'm kinda old school at heart...
And yes, get matched heads. I'd actually lean towards getting another early one- as stated, the combustion chambers are smaller and you can use all the squeeze you can get.