If that Cub has the same mower that Dad's Cub did it will be a sickle type mower. There can be a lot of upkeep to one of those, they don't have the simple rotary style cutter blade that only needs occasional sharpening and balancing. They have a similar shearing action to a pair of hair cutting shears. In my experience these sickle bar mowers won't do good enough to provide a clean cut for a lawn. They are good for larger areas where you need to keep the grass from getting too tall and drying into a fire hazard though.
The Cub and sickle bar will work good for the outlying areas, as long as you don't have any very heavily sloped areas. And a smaller rotary style lawn mower just for the lawn around the house would be a good combination of equipment. Then add a weedeater for getting close to objects, such as trees, fences, fence corners, and ditch banks, and you would be all set up.
Here's a Wikipedia site:
http://en.wikipedia.org/wiki/Mower
Here's another site that has some good close-up pics of the sickle, bar, and points. The only thing it doesn't show is a close-up of the opposing edge inside the V of the point, which provides the other half of the shearing action of the cut:
http://www.sickleservice.com/resources/faqs/
For me it would be a no brainer to get the Cub as it would be a nostalgia trip for me, since I grew up around one.
I don't know how long your driveway is, but I grew up with one over 600 feet long. To help maintain it Dad used the front cultivator bars, a pair of cultivator shanks with the shovels removed, and a section of used grader blade. One shank was mounted on the left side bar, and the other shank was on the right side bar. They were mounted so they were angled to the direction of the motor/driveline, not 90* square to the driveline. The Cub was too light to move much dirt this way, but as I remember it was good with moving gravel on the driveway as long as you didn't have big potholes to fill.
Here's a Cub front cultivator on
Ebay:
http://www.ebay.com/itm/OFFICIAL-IH-Farmall-CUB-FRONT-CULTIVATOR-MOUNTS-with-TOOLBARS-/321442182447
Here's a pair of cultivator shanks on
Ebay:
http://www.ebay.com/itm/Pair-of-Cul...ernational-Cub-A-B-C-BN-Tractor-/391076416202
Here's a clamp that held the shank to the cultivator bar:
http://www.ebay.com/itm/OFFICIAL-IH...MP-Cuff-140-130-Super-A-100-Cub-/221700222815
This wasn't an easily adjusted thing, but it was an in-expensive solution to a need.
Good luck with the new property, and I would love to see pics of the Cub if you get it.
Don