Desilove:
I had a similar situation when I bought my Roadster. The registration, the previous owner, and the original bill of purchase from the dealership (can you believe I even have that!) all say that my car is 1969, but I went to
www.datsunroadster.com (Rallye Ent.) and it has a section called "what year is your car really?" and my car is actually 1968.
I found out that there was a big class action lawsuit in 1970-71 because dealers were selling the "leftovers" from the previous year's models as the current year's models.......go figure!
Give the website a try, it gives you all the ways to check the true year.
Congratulations and welcome to our family!!!!!!!!!!!
Jorge
Torrance, CA