How about the swift GT engine with a turbo and the cam reground the same as the XFI engine? that way you would have a small 4 cylinder engine that will bolt right in with alot of low end torque and a bit of boost for when you need to make it up a big hill.
I think there is also alot to be said for a tuned intake based off the stock throttle body because I agree, from what I've read the independent throttle bodies mostly help with high revs.
I also don't see the point in disk brakes, they are less likely to lock up and they have less over all stopping power along with being a costly swap, also a single wider tire offers less rolling resistance then a set of dual rear wheels/tires, the draw back of the wide tire is that it's less stable so it does not handle as well, the increased mileage is why you see some semi's with single wide rear wheels/tires and single wide trailer tires, so a set of 175 or 185 wide rear tires would work for you and even be available as a low rolling resistance tire without the work of making hubs for dual wheels and because you will have very little weight on the rear of the car the handling should not be an issue.
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