".............The later rear boosters have a small alignment notch cut in the booster bodies that will not allow you to swap them to the wrong sides in the rear........"

I believe this carb has them. I circled the area that has the cutout and there should be a corresponding raised area inside the carburetor.


[Linked Image]Carb-AFB by M Patterson, on Flickr

1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold
1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold
1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears) under construction