[JFryauff]

Since every runner has a throttle body, and there's no "log" that all the cylinders have to eat from, no restrictions. Much better performance once tuned right, but slow cruising is a bitch! It has a lot to do with the right sizing for your engine, and using a good fuel managment/timing set-up. A body too large for the motor is what causes the drivabilitiy problems. This happens anytime you use a throttle butterfly that's too large, wether ITBs or a plenum setup. The area of a circle (the throttle plate) increases exponentially (as opposed to linearly) with increase in diameter. So a relatively small increase in throttle bore makes a relatively large change in the amount of open area you get with the same amount of throttle input. Smaller bodies or a clever progressive throttle linkage would help. An 8v doesn't flow that much to begin with, so going huge on the intake doesn't make sense. If you have programmable EFI, it may be possible to make it feel smoother by underfueling at high vaccuum (nearly closed throttles) and eliminating accel enrichment, but hopefully there are better solutions.