Join Date: Oct 2000
Location: Sandwich, IL United States
Hey, I am currently in the process of putting in a 355 sbc in my 67 chevelle. My engine combo is very similar to yours. I went with the 670 cfm Holley Street Avenger and have only good things to say about it. I don't have the engine in the car, running yet, but so far the carb has givin me no troubles. 670 cfm should be just right for your engine. The 570 may be a bit small. Well, best of luck to you in what ever you decide.