Should really get back to mine, putting a pinto in the Triumph is getting in the way though lol.

Find a late 940 2.3 turbo with the proper 5 speed box (not the overdrive m40) and you've got a good base. If you're lucky you'll get one with a locking diff too. It's easy to get a locker for them from America if you haven't got one though (apparently). or you could just weld it...