I ran two deuces back in the day (mid-1980s). It was a little difficult to time both carbs, but if I knew what I was doing back then, it would have probably worked much better. The switch to the 4bbl carb turned out great for me - my fuel mileage went up quite a bit, which was important to me at the time since the car was my daily driver back and forth between the Central Valley and San Jose, CA (about 90 miles one way).