Hi,
I got to pick up a matched pair off ebay and it happened to be owned by a friends friend hence was able to check em before I bought them.
Please a few pointer's
1) If you are picking em up in India would suggest you go to the guru's as they will have all the supporting stuff available for them
2) If you are buying them abroad please do make sure that they are a matched pair (The serials on the webbers will tell you so) and also make sure that you speak to people and pick up jets for your particular requirement.
Suggest you go through the following website before you order the jets and the venturis...
http://members.aol.com/dvandrews/webers.htm
do go in for a ready made aluminium cast manifold if available as it gives you better flow rates from the ones you typically fabricate.
I am currently running an esteem with the webber's 40 DCOE's.
Let me know if you need any further info.