This is one of the few combinations where it may help to telegraph the lead punch - the jab to the body, preferably the chest area, may draw the opponent's hands in a bit - it may even drop them down some to defend against the upper-body shot to their chest - a quick overhand right can follow your immediate drop & jab to their chest - oftentimes, the jab to the chest may not even need to be thrown if a simple feint down low is feasible in the hopes of sneaking your overhand right over their blindside shoulder.