What quaife?

If it's a big tooth box then they use the Ford casing which should fit. The one fitted to my Dads car was a Ford casing but with a big tooth gear kit. If you take out the reverse lamp switch you can see the gears. If you have the standard box then you could compare them to see if you have been sold a quaife box. The difference is obvious when you look at the 2 different types of gears.

If it is a quaife box then I see no problem in enlarginf the hole with a drill for the clutch cable.