Welcome, JoAnn!! I have not used evaporated milk instead of regular milk to make pudding, but I am sure that someone will have an answer for you. You might try posting your question under the dessert thread.
Welcome JoAnn! Where in Iowa do you live? My husband (you'll see him around here--his name here is Maidrite) is from Ottumwa. I'm sure you will love it here as much as we do.