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May not be all that simple, depending -
Does the 4.0's distributor have a vacuum advance on it? If NOT, you'll need a distributor too. Most, if not all, the injected 4.0's used computer controlled advance.

The in "tank pump" will be waaaay too much pressure. Simply unplug it, it should flow through OK - then use a low pressure 5 lb electric pump.

Passing emissions tests will probably be impossible, they want stock!
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