Build sheet was used by the assembly worker to put the options on the car that it should have on it. They were never intended to be put in the car, but rather then throw them away they put them anyplace they could. They have been found under the carpet, glued to the back of the drivers door panel, in the back seat upper frame springs, on top of the gas tank. Black Cherry car is a very nice color. Looking at the motor a lot of original parts are gone. This car will need a lot of work.
Check this link out for some examples
http://chevellestuff.net/1970/bs.htm