I have a Eddy 600cfm on my slightly moded 360 with my total timing set at 36 degrees. I have great idle with excellent throttle response. The 600cfm seems to be a good match for my application. Which is an Airgap intake, Crane cam and the heads have been cleaned up. The block also has been bored .30. All of this going to TTI headers and X-pipe.
Like everyone has said, It depends on what you are going to do with your car. My car sees mostly street use with some track time.
