Suggest you don't get just "other " people's opinions but get the opinion of the guy that wrote the book on Webers for Cobras as he did all of the work on setting up his Cobra - not other types of cars. You should talk to Jim Inglese - only!!!!
He can be found at his website and contact info.
http://www.jiminglese.com/index.html
I guarantee you will not be sorry that you followed his advice.