I have already obtained my replacement engine. Last Nov., IIRC! It is a lovely '82 R65 (nikasil, big valves!) with 37,500 miles on it. I consider that an improvement.
I have always had a 650 engine in it (this is my third...), and I think I would miss the "revability" that the R65 has, that I don't think the long stroke engines have.
I got it for $500 + shipping, and it was professionally packaged, so I am happy.
I am not so interested in making it "special", as I am wanting it back on the road, so I can figure out if I have the balls to get back on the death-defying horse. I thought it was already pretty special before I wrecked it!