I have a 73 Z28 that I would like to get looking as close to stock as is practical, but I don't have the correct air cleaner base that would have the tube to connect to the passenger side valve cover. It appears that the driver side valve cover should have a pcv valve with a 90* fitting that the hose to the front of the carb base attaches to. I think I have a pretty good bead on how to do the drivers side, but don't know how to approach the passenger side. I've looked at several vendors but can't find any that address this. Any input?