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If you are after all out horsepower, you want the engine to breathe better.
if you want better mileage, you are going to probably be running at VERY little throttle opening, and trying to get the most power out of the least air and fuel.
For these reasons, changing your intake won't help for mileage.
Further, opening the exhaust won't give you better mileage. Your engine was designed to make 70 horsepower max, so it doesn't need very much exhaust or intake.
Your VX is a pretty cool car. You are going to have a tough time making the basic engine more efficient. I would look at ignition timing, check compression, and learn to drive it.
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