Running a stuck engine

Bought a Dart Sport with its slant six seized up. Pulled the plugs and poured a little transmission fluid in each cylinder. I let it soak for several hours and put a pry bar to the teeth on the torque converter to turn it over. It broke free and turned all the way around. Put in a fresh battery and plugs and it started! With tranny fluid burning, did it smoke? You bet it did. Ended up rebuilding it anyway.