RE: Trainer posibilities.
Looks like a good choice to me (thinking about the price).
I would bench test the saito when ever its on your hands, if the engine is complete (with out talking about the valve covers) is a very good deal and if it happens to be a little weak, try changing the ring and bearings, it is cheap and will give new life to your engine and of course will haul that trainer very good.
Good luck on that.
Alfred.