Not to much information to go on here but you did say it needs plenty of work.
Have you gotten photos of it, sounds like you are not sure of how many panels it has.
In those earlier years there were also differences in models just based on which factory it came out of at which time of year.
Keep googling with different search words and sentences and it will lead you back to most posts here and images and Airstream archival information also.
You can also look under the specific threads here for that model and private message with other owners of the same model for specific answers.