I did a few sprints in a modified F.First with an HT engine. The others are correct. It is a standard box. Go for a Quaife gear kit, or, I believe, one or two gearbox people were doing a "close ratio" box based on standard gears from other boxes. A sort of mix and match. Jason Watkins has one in his Mk2 XR2 and it takes the power of a full house HT race engine
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