A friend of mine has a pug 1.9 TD intercooled motor in his SJ ( i know its not a vit....) , had his gearbox converted by one of the 'specialists' to bolt on but it died within a week, he now runs an LDV van (sherpa) gearbox, bolt on solution apparently but has low gearing in 1st and 2nd. This means making up the prop from gearbox to transfer case and mounts for box and engine, and if you dont have a body lift you need to manufacture a new transmission tunnel as my friend has done and he's also lifted his bonnet by 2" to clear the intercooler - cut and shut, bonnets now 4" deep lol.
Gary