360 Build suggestions

You will be fine with the 600CFM carb. Too many psych themselves into bigger is better. For the street, you'll almost always be happier with a smaller carb. Better economy, better low end response. If you look at one of the carb sizing calculators, you'll see just what size is optimal for your setup.
agreed, for cheap i once used a 600 holley on a 440 and the throttle response was much better than the borrowed 750 i had on there. i only noticed a performance drop around 5000rpm ish and up where it 'flattened' off the power. on a 360 it'll be fine.
neil.