Where the hell do you get one from? which car did it come from?
It's obviously of the same vintage as the M20 lump, as it seems to have the same distributors on each bank...
In fact, I'd guess that whatever that enging is, it started life on the drawing board as two M20s bolted together!
I didn't follow all of the other thread - did he hook it up to the standard 318 gearbox and diff? It must put out a hell of a lot of torque....
I think if you put that in a sportster, there would have to be some interesting modifications to the engine bay panels - some long, aerodynamic blisters either side of the bonnet...