Maintenance problem? That car is over 40 year old!
They ALL are going to require a good amount of maintenance when they get that old. As I said before, if you can do the work yourself you are fine. If not, you will have to find a good repair shop to keep up with it all. That oil leak might be nothing more than a missing bolt in the front of the block. It might be the front seal or even a valve cover gasket. Hard to say from here.
You probably should go for a newer car that won't need as much regular upkeep.
Another buyer will probably snatch it up pretty quickly if it is what it looks to be.
-Mark.