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If your planning on putting that engine in, you may wish to consider trying to get a non-California HF transmission to go with it. The transmission gearing seemed to me to be 50% of the improvement in mileage, in going from a DX engine to a VX engine.
If you have a DX, you'll need to modify or purchase a modification cable adapter from someone like Rywire. The DX uses a throttle body injection system, where the VX engine uses a separate injector on each intake runner.
You will also need to get a ecu for a 92-95 VX. IF you get a non-California one, you will need the 5 wire, lean fuel oxygen sensor, which may come with the engine. If you are going for mileage, you should get better mileage with the non-California ecu. The California one uses a 4 wire Oxygen sensor. It still does well, but it is probably about 3-5 miles/gallon below a non-California unit.
From what I understand when you get it all operating properly, you can still get it to pass the smog tests.
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