Find a gearbox form a 1989-1995 Ford taurus SHO.
Same bolt pattern as 1.6 cvh.
You will require a different clutch disc as these ones are 7/8" 20 spline input shaft.
There is also a Quaiffe diff available for this gearbox.

These gearboxes were standard on the 3.0 and 3.2 Yamaha V6 engines.

MTX 75 is also a great option - I think it requires some cutting as it is longer
than stock gearbox.