In most cases, you do NOT want ram air in the carb. The purpose of the velocity stack is to minimise blow out of air/fuel mixture at certain portions of the combustion cycle. If you point it into the airstream you will likely have problems getting a consistant needle setting for all conditions, it will change between ground tests and airborne use. I can't remember for sure where I saw it but think it was in one of Clarence Lee's writeups explaining the purpose and best use of the velocity stack. Now, if you have the engine completely cowled in with no direct outlet at the carb, you may find one position is better than another for the velocity stack due to the circulation pattern inside the cowl.