I believe I remember reading that the injectors for the maybe the SWD9, for sure the 600 and 650, are different(upgraded for more HP) than the WD-9. The WD-9 ones would physically fit in the head but not flow as well. Same deal with the injection pumps.
If by the "air cleaner top" you mean the breather cap that's above the hood, most pics of restored 650's I've seen have the plastic bowl type like the 560's had. Mine has the glass jar type(with a little green JD tractor in the jar). WD-9's could either have the glass jar or the mesh breather type I think. They'll all "work" as long as they're the right size for the tube, which is bigger than an M.
I bought my 650D for $300. It was stuck and had been sitting for quite a while. Had it running the same day I got it home. If you get this one and for some reason it's beyond repair, I'd sure be willing to buy the "650" emblems off each side of the hood. I'd pay a pretty good price for them too!
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