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Air Box Removed on 77 Turbo 3.0

Engine

Vehicle Information: Year: 1977; Engine (Size, Modifications): 3.0 turbo; Total Mileage: 91,000;

I have completed my engine reassembly on an engine that was partially apart when I started. The air box was removed to make room for an after market inter cooler and a small filter was installed to replace it. The return line coming off the exhaust is plugged with a spark plug, the breather line coming from the turbo sump tank is laying on the engine open, and the small line coming off the back of the engine compartment is also laying open. I have the air box but don't know what I'm missing to hook it up if I decide to do that. When removing the engine I noticed condensation under the oil cap and in the oil lines coming from the tank. So my question is, do I put the box back on and find another method of cooling? or can I cap off or install filters on the three open lines? The previous owner stated that with the inter cooler the engine temp in traffic dropped from 260 to 220 and I would hate to loose that. Also what about a cool collar for the oil filter?

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