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Welcome to EM MacWord.
The only option for a transmission swap is a 5th generation (1995+) 5 speed. At 55 mph, that should drop your rpms from 2530 to 2200. Its not a huge decrease unfortunately. Larger tires won't do much for you either and as Saberj2x said they'll also increase weight.
If your car is running rich, there is something wrong and its likely an O2 sensor. How do you know it is running rich?
Also, what speed are you traveling at?
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