Don't know if it's a known conversion or not. Got the engine out of a converted 90, but had to make a new gearbox adapter (the original one was a locally made contraption, badly off-center).
The 200 got a cracked head, and the LT77 was in tatters. Rebuilt a R380 and scrapped the 200.
The only reason I've put in the 2.7 is that I already had it, which is a good price
If it does not have enough oomph for this car, I'll pull it out and fit a 3.2 instead, it's the same adapter and mounts.