I do not know about converting an E to Webers but when I converted my Cosworth Vega to Webers many years ago I attached a hose piece to the breather pipe similar to what Steve suggests and then inserted a small breather filter into my hose piece . I keep it tucked up next to the firewall out of the way underneath my heater box. I un-tucked it for this photo to show my breather filter. Just a thought.
