You lucked out. They normally tell everyone that they can only go back 20 years on the build sheet. I know they won't do older than 1988. And if you just bought the car and they have no record of you as the owner (as in service records), they won't send you the build sheet. I bought a 1984 Daytona Turbo Z in 2008 as the 4th owner, and they sent me an email that since they can't verify that I own the car, they won't send me the build sheet. Luckily I have the original, though it's ripped, worn and has rust stains across it from the seat springs.