Ok, basically on the end of the air feed to the carb there should be a cool feed to the wing which isn't too important tbh. There is also a second hose which clips into the bottom part below where the round lump with the vac pipe going to it, this feeds to a metal shroud bolted to the exhaust manifold.
It is needed along with metal shroud, mine sheared off a few months back. I thought I could get away with just tucking the pipe next to the manifold but I got problems with carb icing. The car would often stall at lights, even with the cold air feed removed. I clamped the shroud back on with 2 jubilee clips at the weekend and its been fine ever since!
