Well I'm afraid you are all too late. I was on a outback motorbike ride back in late 77 and stopped to have a beer in an outback town pub when I came across the only known survivor of the Nissan/Datsun Dealership. We became firm friends and the following year we found the buried site which we later dug up and trucked the datsun's to a secret location. We are now still cleaning all the sand out of them and are hoping to open up a museum in the near future.
That's a J15. Leave it where it is, you could probably run faster than it. They came out in 1200, 1300 and 1500 CC's. Copy of an old British Austin engine. Came out in Datsun's in early to mid 1960's. Still got a tool kit out of one I had years ago, has imperial spanners.