Trying to determine the value of my 310 gx

[Micaho]

I'm looking to sell my 1980 Datsun 310 gx hatchback, but have no idea what I should price it at because I can't find any others out there. The car itself is in pretty decent shape, some minor scratches and dings and has only 76,000 original miles. The only issue is the head gasket is starting to fail and I do not have the time to replace it myself. It seems like it would be a fairly easy fix for someone who is mechanically inclined, as far as head gaskets go. I have kept everything as close to stock as possible and have recently replaced the fuel pump and water pump. If anyone has any insight it would be greatly appreciated.

Link to pictures here
https://flic.kr/s/aHBqjBsc9S