Over .600 lift for a 347 street car is a tad much IMO. I would be looking more in low .500's. I'm generally on the conservative side when it comes to cams and tend to think people offten over cam their street cars. If it were a race car, it might be different.
Just my opinion though.
Call CompCams and see what the suggest.
Larry
I used the Nostalgia Plus Hyd cam & it gives plenty of power for a cobra on the street. Not that a little extra would hurt . If you are going with a single carb setup pick a cam that fits your needs. If you plan to go with webers at any point pick a cam for those. The Nostalgia plus sounds really nice with a single carb but not a "lot" of lope. Pulls pretty good in a gocart.