Stock 350, no hot cam, lifters stock, no special rods or pistons. Only mod besides the carb is exhaust headers. Back in the day I considered myself a fair tuner and could adjust about any carb. So the engine is running rich. I screwed the air mixture screws in and was able to close them all the way without the engine stumbling at all. Is that normal for today's carbs or do I have another issue? Burb starts and runs good just seemed to be on the rich side.