If I recall, film speeds were quite slow with most averaging about ISO40 or ISO50. I wasn't alive at that time, but I believe the fastest film was ISO200, which was Kodak Super XX (I'm not positive on that name).
I would test the camera with Kodak TMax 100 or Ilford FP4+.
I'll also add that I often will test a camera with Kodak Gold 200, because it's a nice film with good rendition of color. And you can get one-hour processing to assess the camera and see if the shutter is working correctly.