odds are the costs of finding parts and the age of the bow, it would be a waste of money to restore, unless you had some sentimental value to it that would be worth it to YOU< and NO one else!
best advice is put it back in the trash where you found it!
limbs could be bad, or other parts, that will be safety issue's
or there just about to fail from age alone making it dangerous to shoot,
its not worth fixing or risking shooting it! IMO