Build sheet power steering code?

I am trying to figure out if my 1970 340 Dart had power steering. In the build sheet the last line section for Suspension- Steering has a number 7 typed in the Power Steering box. Not sure what that 7 means. Does anyone know?

Not original engine (has a '69 now) and it's manual steering, but it is an air conditioning car and I have read those are usually power steering cars.

Thanks in advance!