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From what i recall,put a 3.5 injection system on a 3.9 and you will blow it up,as with a 3.9 on a 3.5 a dought it will do it any good,incorrect fueling?
So the exhaust is an easy upgrade, the rest of it I'd leave alone unless you want to run the hot-wire EFi rather than the flapper. Hot wire will run in open loop (non-tuning) mode without lambdas and closed loop (self-tuning) with lambdas. You change a resistor in the wiring loom to tell the ECU what to do.
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