use some aluminum tape that is used for hvac work (the true duct tape) to cover the holes in the air cleaner until you get the weber. I would wait until you get a new harmonic balancer, then change it and probably the timing belts and tensioners, and check the silent shafts for play. The egr valve should be pulled off and either clean it and the passages, or make a blockoff plate and forget it. Clean or replace the pcv valve, and gut the cats - there may be a cat in the exhaust manifold besides the one below it - look up into the manifold to be sure there isn't one in there.
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