He made four pastoral visits while serving as the archbishop. In 1951 he offered his resignation to Pope Pius XII though the pope refused it. But a compromise was later reached in 1954: Ermenegildo Florit was made the coadjutor so that he could aid Dalla Costa in his episcopal duties as the aged prelate grew ill.
He made four pastoral excursions while serving as archbishop. In 1951 he tendered his resignation to Pope Pius XII but the pope rejected it. Later, a middle ground was reached in 1954: Ermenegildo Florit was appointed coadjutor so that he could help Dalla Costa with his episcopal duties as the elderly cleric grew frail.