Hey, nice find. I myself just bought home the exact same model last night. Looks to be in the same condition, tho mine costed $50. Although its a good start you might want to considder looking for another and stripping this one for parts.
As for the oil I use Penrite. That link will tell you what oils to use and how much for the engine, gearbox and diff.
Does it have a 4 or 5 Speed??
Also since it has rusted guards you might want to check the vents in front of the windscreen. Assuming this car was sitting outside and was under a tree, the vents fill up with leaves and then rust out the tunnel causing water to come into the cabin.