Need certain info to get 100% accurate, such as top gear ratio, ie 0.83:1, if it is N3 type box still ?, tyre size used if different etc, diff ratio I would assume is the std 3.62:1.
Assuming it has the std ford listed 195/60X14, plus std diff/box it is 22.45mph/1000rpm(5th), so easy to work out from there.
tabetha