Hi Chris,
My S III had individual air filters for each carb. The rear air filter had
the tube fitting out the back, which was connected to the similar fitting
on the oil filler neck with an appropriately sized hose. This in fact
provides some of the crankcase ventilation. The front air filter had a plug
in place of the fitting, presumably so that it could be interchanged with
the rear one if necessary.
On the manifold, the front connection should be connected with a suitable
hose to the brake booster unit. This provides the operation vacuum. If you
don't have a brake booster, or it doesn't work, then the hose should be
blocked off. The rear connection should comprise a PCV type valve screwed
directly into the manifold, from which a hose goes over the engine to the
hose connection on the valve cover on the right hand side. This provides
the bulk of the crankcase ventilation.
John S.
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