I am partial to the original Ford Sidewinder manifold that I installed on my Kirkham. They are not cheap, but clean examples are around.
The Sidewinder is very efficient as the slightly offset plenum affords equal intake runners. By the way, do not let anyone tell you that this offset will create an hood cutout clearance problem with your Kirkham - it does not.
In an original spec chassis like the KMP, the engine offset counters the carb offset. Use it with confidence - it's a great piece.
Bud
