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I have an older G10 in my 99. The main difference is the crank sensor and pulleys. If you found a newer style body, the engine will go right in. To get the most out of the XFI engine, yes you will need the computer also. The XFIs had a lighter body however.
I would just keep the car/engine combo you have and get some salvage yard seats and whatever you need. You have nothing to lose on this car you have, so modding it would be fun!
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