Dual 850 double pumpers?

Not at all, Plenty of happy street dual quads. Some stress on overcarburetion but the math doesnt compute if they add the 2 CFM's together. For instance, the triple deuce six pack was 'supposed' to flow like 1350 cfm but it actually flowed closer to 780 cfm on a 440 just because the pressure drop across 6 open bbls is alot less than across 4bbls or even 2, hence the different ratings for 2 and 4bbls. Go for it.