You should be able to find the model number on that machine around the wheel end of it, but you need to know Long Shank, slant shank, or short shank. The older models of the Montgomery Ward machines were very good metal made machines and hold up really well. If you need help in determining the shank, Clotilde's has a guide for determining the type you need. (You can google them and find it online.) I got a 1/4 in foot with my new Elna in April, but I know our LQS orders them to fit all machines.
Make sure you are holding that ruler down tight when cutting, that can make a big difference in your blocks as well.
Have fun with it.