When I was at goodguys earlier this month I was talking to some 37-40 Ford owners and all of them had newer VA setups because they replaced their old ones for lack of flow. They said their new design is much better. I hope they're right. I know a couple of guys with VA in their 71 and 72 chevy trucks. They are newer setups and both of them don't defrost well nor cool well. I just hope when I get one it works well. I actually was thinking of trying to install rear air into the system but those are just thoughts at this point.