If the carb is NOT the Mitsu carb (and the mess of vacuum hoses are gone, check my web-site for the Vac Hoses pages), then you will fail smog test.
If you're only burning oil, there may be a few tricksto try first, but it depends on how bad you failed. The burning oil seems to mess up the cat, and it won't work very well anymore.

Don `87 Mitsu 2dr, Rubicon survivor, GModified.