Most parts for those guns are still available, but if it is in that bad a shape, it might not be worth trying to restore it. If those parts are worn or broken, what does the rest of the gun look like? I suspect that gun, like a lot of western guns, was "rode hard and put away wet", so the barrel is shot, the bluing is a memory, the stock has no finish left and maybe is cracked to boot, and so on.
Besides, even in poor condition, the gun has some collector value. With new parts it loses even that value.
I think I would retire the old gun and buy a newer one. While top condition pre-64 94's are getting pricey, good, usable ones are still available at reasonable prices.
Jim