I am still looking for a RWD bellhousing to mate the GA16DE to a RWD chassis. My construction makes this a possibility if I can find the bellhousing. I have been reading up and I think that 200 HP (at the crank) is doable NA. That would be just the ticket for my installation as I am restricted (by a single air restrictor) to about 175. If you find something, let us all know.

When I searched for Triumph engine swaps, or something like that I found this site.

http://www.triumphspitfire.com/engineswaplinks.html

There is a Triumph Spitfire with Nissan 1600 engine swap listed but following the links didn't get me anywhere. Maybe someone here smarter than me can find that article. It really doesn't say that it was a GA, just a 1600 so it could have been a 2v 510 engine.