that hole is usually plugged. nothing attaches there. looks like someone has attempted to plug it with something at one point. you could put a screw or a bolt in the rubber boot
ok so that hose you have there is for the hvac, that is probably where the missing hose is that was leaking from the intake, connect the hose to the intake fitting
the unit in the circle is the cruise control box. which uses vac. its weird that some of the 95+ used vacuum acutators for the hvac, and previous years used cables. either way it looks right how you have it now.
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