Rebuilt carbs tend to be junk; see
here.
Holley 1920 vs. Carter BBS, see
here.
Walker. Also put in a new float; the 1920 uses a nitrophyll foam float that takes on fuel and gets heavier than it's supposed to be over the years. See
here.
That'll come as a surprise to those who've been steadily buying-down my stash of
new (not remanufactured or rebuilt) slant-6 carburetors. ;-) You're right there are none presently being manufactured, but there are still some NOS units floating around.
