Lambchop

Hello, I'm a young driver after my first car and since I work in an insurance agency I came across an older women selling her Nissan Datsun 1974 260z with duel corroborators. I don't know much about cars. But it looks like a really cool car to have. I haven't been able to find much info about the car or about how much it could be worth. It only has 25,000 miles on it atm though. She said she thought I should research it more before looking at it and her only warning was that it ate a lot of gas, that I probably wouldn't get much more than 20 miles to the gallon with it at best. Thoughts? Help? Please I'm not sure how these forums work so if you want you could contact me at andrew.lambchop@hotmail.com Thanks much! -Andrew