Yeah, I was shocked too when I found out how big of a difference it is between the calibration on the 2 carbs. I have no experience with the demon or holley carbs, but I hear great things on this board about the demon carbs. I think you can calibrate that carb to perform fairly well with your motor, but there are guys on this board who have been wrenching longer than I've been alive , so I would say to take their advice over mine.

Thanks for the compliment on the car. I have a 360 magnum based 408 going into it now, built by another member here. Putting a Holley 3310, 750cfm vac secondary, on it.