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All I can tell you is on the 4.2 engine the only vacuum lines you need is distributor and brake booster and fuel tank vapor line and the front axle half shaft vacuum solenoid. So I would say your best bet is if you are getting rid of the weber then go with a MC2100 or MC2150 because they are very simple and don't require any weird air tubes. And trash all the other vacuum junk and disconnect the EGR valve and plug up the ports.