a 76 does not have airbags and does have good bumper hookups. If you go to a shop I would suggest they fab a setup like on a old jeep. Get a to bar from wally world or harbor freight like used on vehicles of that era, you dont really need the new fancy types unless you really have to have one. Even then you can just have the mounts for the cross bar fabbed and added to the bumper portion for the hook up.
When I looked at a shop to ab a tow setup for me even hitch places they really did not want to due to liability if something went wrong. I guess they are just being realistic? Anyhow saw some tow hitches on craigs list for tucson area less than $100