Demon Carb
Are you sure about that? When I had my Road Demon apart it appeared that the ports and passages on the bottom where the base plates mounted were not the same and for sure the bowl bolts were larger in diameter than the Holley bolts. Plus the choke mechanism was different. Once I gave up on the Road Demon I had visions of using the electric choke on a Holley 3310 750 and it would not mount.
