You’ll have the Ford 2000E type box with the larger Speedo drive as fitted to Triumph TR, MGB and Healeys , about £60 on FleaBay etc.
Don’t be confused by the similar looking looking cheaper but smaller Spitfire/Stag one, it won’t fit. You’ll probably have to take the gearbox cover off to fit but may be accessible from underneath with a ramp (?). Burton to an ‘improved ‘ version but at £117.00 (!)
