Oh I definately think you should get these up and running. The black one is a Singer 66 as Sheri said and the other appears to be a Singer 328. Is the 328 a pale green?
The 66 is a good straight stitch machine. The other has a cam compartment up top so can do zig zag or decorative stitches if you have the cams. *They look like flat black discs. You can see photos of mine posted in the cam thread.