Heres one for you weber techies with the solex manifold.
Performance parts wherehouse in Haupauge NY has 40DFAV carburettors in stock for $239.
The also have 32/36 and 36/36 DGVs for $169.
see http://www.webercarburetors.com
All mount up to the SIV solex intake manifold, and require only minor linkage mods and carb flange port enlargement.
The 40DFAV is a non-progressive 2bbl with twin 40mm throttles. This is the highest performance bolt-on to any factory alpine manifold, and is second only to the twin DCOE setup on the hartwell type manifold.
Also, these people have the lowest cost on the DCOE I have seen in years, plus they ship for free.
BTW I happened upon the fact that they sell the 40-DFAV because they shipped me one on accident.
PPW 1-800-654-2778
Jarrid Gross