How Can I stop my 85 Chrysler 5th ave to pass emissions if it smokes

Oil smoke (blue) or coolant smoke (white) will not cause your vehicle to fail emissions test. If you have Fuel Smoke (Black) this will fail you. This is caused by a rich running condition. First place to start would be a complete tune up and if there is a check engine light on, have necessary repairs made to turn light off. If this is a carburetor engine, you may also need to have the carburetor tuned and the ignition timing set. No need to worry about the smoke if it isn't black.