as an acls instructor since 1987 and having been involved with providing acls classes for a few nursing programs
over the years, might i suggest that having an outside group of experienced acls instructors who actually use acls (codes/ critically ill pts/ etc) daily, seems to work well.
as to having nursing instructors become acls instructors, unless they are er/critical care nurses (and actively working er/icu/ icu), this is less then useless & will not properly prepare the students for what is expected of them.
the classes that we have provided to nursing programs involved us also providing "prep" classes (such as reading ecg's/ airway/ pharm/ etc.) so that when we started the acls "class", the students were prepared for the core material. we've always had positive responses from the students with the course we've presented this way.
this is what we found works for us, hope it helps. good luck!