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Brian,
My memory may have it a bit inaccurately but a Holley throttle body is somewhere around 1-1/2" shorter than a carburetor.
The MPFI throttle body measures 2" from manifold flange to the air cleaner flange. The newer "all-in-one" EFI units measure from 3" to 3-1/4", closer to a carb's height.
With the MPFI, the injectors are in the manifold vs in the throttle body for the all-in-one units.
Overall height also depends on the type of elbow (e.g., round or oval-shaped) you choose.
Hope this helps,
Tom
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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