Off idle hesitation - solved

also which areas of the plenum are favoured by which runners

screws set to achieve consistent mixture at the inlet valve of all may not be set exactly the same up at the carb.
Absolutely! Say we're running a dual plane intake manifold. Do you think each side of that intake will have exactly the same vacuum signal? Hardly. Even on something like a slant 6 with a two or four barrel, while theoretically, each side "should" have the same vacuum signal, it most certainly "may not". That was a great point, Dave!