You should be able to "rob" the pack of an individual sheet of film to develop and test the exposure. The Ansco pack will probably much the same as a Kodak film pack. Based on a Kodak pack, after exposing a sheet pull the tab that moves the sheet to the back of the pack. In the dark open the pack holder and remove the film pack. Then open the the film pack by removing locking end and take out the single exposed sheet and process it. Reassemble the film pack and put it back in the holder. Be careful when opening the film pack because the metal parts of the pack are sharp and you can cut yourself very easily.

Gord