I believe the T16 was also used in some Land Rover Discoveries, not sure whether they were exported though. I believe they were underpowered with just a 2 litre in such a heavy vehicle.
The gearbox will be a LT77 or the later R380 both used in the plus 8.
The bell housing to mate the gearbox to the engine was from an LDV van as the engine was a front wheel drive in the saloons
The T16 was also used in Rover 200/400/and 600 saloon (sedans), not sure if they were exported. There is a Turbo version of the T16 engine also though i am not sure if any were factory fitted, MGB owners sometimes fit these as an upgrade.