Allen,
You don't have to worry about the PCV valve with your webbers. If you just take the breather cap off every so often and clean it you won't even get any
oil film on your motor or cover. The webbers are enough to keep tuned without trying to use this. Some of the other guys who are running webbers may be able to tell you a way to hook one up but when I had them years ago I never had one.
Ron61
Ron Widener