1968 CB350

[pekingduck]

That's a nice barn find. I would do nothing more than you've stated, except lube up the cables. Unless there is rust in it, the front brake cable (and the lever and cable pivots) probably only needs lube. Almost all replacement cables are black in color, and most will not have the in-line brake switch.
If it doesn't have a maintenance-free battery, make sure the battery breather hose is in place and running to the ground.
The seat probably has a heavy red foam rubber, and is thin you might ask about a higher density foam.