No reply to emails? I'd keep looking. And I have heard that these are not authentic Webers, but I am not certain about it.
If they don't answer your questions when they are trying to make a sale, imagine how poor the customer service will be AFTER they get your $$$.....
You might try Pierce or Redline. or Inglese, but Inglese is now part of Comp Cams and RHS. Inglese himself is still in business, and you should also ask him. He probably knows as much as anyone does about these V8 setups....