Thanks Richie. Yes, I see the one I thought was the Bulldog is a 1700, and the actual Bulldog is an 1100 shaftie.
That's the one I was thinking of. But since it's just an updated Shadow motor in a naked roadster frame with what looks like the same shaft drive as my Shadow, I don't think I'll bother!
I think it was the MT01 (1700) which impressed me with it's slow revving nature, but as you say, it's chain drive..