The charge-robbing due to the siamese ports is exactly what I was working around. The TBI have the injectors above the throttle plates so that at part throttle air mixes with the fuel better.
At least in theory, all of the air within the manifolds should be uniformly mixed with fuel, so that the timing of the intake valve events doesn't have the opportunity to pull more or less fuel. This is all pretty crude poor-boy experimentation, so no idea if it will work well. (Or if I'll be able to shut the hood...)
