Carb too small?

I have a Edelbrock 1406 600cfm carb. I was wondering if it will be ok for my motor. The motor is a 67 383 out of my 67 D200 camper special with auto tranny. I honed the cylinders, reringed the pistons, put new bearings in, and put a cast iron 4bbl intake on it, the heads are 516 castings, the cam is new but factory grind specs, it still has the points distributor. All I am going to do is cruise around with it. According to the cfm calculators I searched I would be fine with around 500cfm but that seems small. Would the 600cfm be ok for cruising with this motor? Thanks for the input.