Well, I'm not sure either is at all original, the supoerswift base on the left looks far too old (60's maybe) for that Honda engine, and the rover base looks to be 70's, with a 90's techumseh.
I'm not a huge fan of techumseh engines, so I'd cosider tracking a briggs of the corect vintage for the rover, which would not be hard (I'll see what I have for you)
As for the Super Swift, I'm not sure what engine you are looking for, but I'll have a dig, it could be a Villiers 7f you want for that.
I would take the honda motor and fit it to a more modern catching base, you could end up with a very good machine that way.
Let me see what I can find in the way of more suitable engines for those mowers, I would easily have a base that would suit the techumseh if you really wanted to be bothered, then you could make a sale machine for a little extra cash.
If you don't want to make 2 newer mowers with the newer engines, I would be more than happy to offer you money for the Honda engine, as well as period engines for the two bases if I have them!
