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If I can pull ~30mpg@55mph with a 3.43 rear end, all the emissions equipment (smog pump specifically) hooked up, and the motor never getting warm (someone took out the thermostat since the head gasket is probably funny), getting 40mpg out of a truck with a 3.07 final drive, smog stuff disabled, and the ability to warm up seems reasonable. Once you get it running, tossing in a 5speed trans along with aerodynamic mods should be able to get ya near 50mpg. Rebuilding the carb isn't too bad, but there are some parts (w/ little to no wear) you'll want to keep since some (not all) of the foreign stuff in the kit is crap compared to OEM.
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