You have the details on the reg itself so why not find yourself an old back pack of the same vintage and dive it the way it was intended to be dove. One second stage and maybe a SPG (old Seavue would be prefect) and nothing else. There a lot of us that like to dive the old gear in the old way. Forget the BC and the octo, learn to dive old school and discover what diving was like years ago. You will be surprized how easy and much fun it is without all the extra stuff modern divers carry around. I will warn you, diving the old gear is addictive....I have a shop full of it....and more on the way.