Hugh---At this point, I would suggest that you need to establish a
visual reference point on both carbs, to check the vertical position of
the needles, in relation to their air pistons. Removing these pistons
with their connected needles will show how far you have adjusted them
up, or down, in relation to the jets. You can start with both needles
adjusted to where they are 'flush' with the bottom of their pistons.
This may be too lean to idle well, but at least you will know they are
both the same. At this point you can raise each needle a quarter turn at
a time, till a good idle is attained.
It's possible for one carb to be doing all of the work, the way you
described it in your post, due to the interconnection in the intake
manfold. This also assumes that both of the jets to be set equal in
depth, as measured down from the top of the bridge. (Usually at .125)
Let us know how all of this turns out!
Dick Taylor
CF11143
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