Could the old firm hack it in the english first division?

before you all go on spouting crap about the few victories youve enjoyed in cup compititions over the english especially mickey mouse eufa cup...could they compete week in week out with birmingham..sunderland..derby..wolves..w… ham etc keeping in mind there would be no eauropean football to hinder their efforts to avoid relegation..honest answers please and no sh*t about promotion?