smile Ha , they made quite a few different variations of the Rochester B , here is the link to the 48-51 online chevy manuals http://chevy.tocmp.com/1948_51truckshop/51ctsm0663.htm
That’s what my carb looks like , the ball labeled 37 is the one your diagram doesn’t show . do you need it I haven’t a clue . grin
Btw. Ellensburg is a great place to live . I grew up there and my folks and brother are still there smile
Brice Erickson 52 3600
http://www.stovebolt.com/gallery/erickson_brice_1952.html