I can't help you set up your tent. I've never seen one. But I can give you a tip. After 40 years in a bag, the rain fly has probably deteriorated badly and is no longer even remotely waterproof. You should turn a sprinkler or hose on it to see if it leaks. It almost certainly will, but maybe you'll be lucky.

Good luck, but you may need a backup plan for a useable tent.