[Dave at Pelican Parts]

You're correct, they're non-stock (no 2.0s were carbed except for the 914-6es) and the manuals would not cover them. Check the "CDs and documentation" section of Pelican's catalog for a Weber carb book. I've heard it's pretty decent. There's one other book that is supposed to be even better, but it's out of print. (By Pat Braden, maybe?)

CB Performance also supposedly has some good Weber books.

--DD