Looks like I've got it figured out now. I dug around in my junk box and I found one of those Formost blue and white check valves and installed it between the airbox and backplate with the flow moving to the backplate. It didn't smooth out the midrange or idle but then I discovered that the regulator was screwed in pretty deep into the housing. I opened it up till it was flush with the shoulder of the housing and that help a lot. It was too lean all this time. much of the vibration is gone and I've got a bit of tweaking yet to do but I'm off to work so It will wait till tomorrow, but for now I know I'm going the right way and its running very good as is. Thanks. Mike