The Gearbox can be mated to it, I don't think it should be any issue. I was using this box with a 2nd Gen 5E and it worked it like a charm. It originally came with the 1.4 Mazda TC series engine, which the car initially had. Ask me, I think this should fix that over revving problem of your at 60kph and also give you better economy. Further can only be stated by checking out all the components physically. Feel free to give me a call @ 03452388787
As for the ratios;
I: 3.337
II: 1.995
III: 1.301
IV: 1
V: 0.831