Unless you want to go to originality, the vacuum diagram won't do you much good. That model came out with "emission controls" that didn't do much good. In fact they might have done more harm then good. It probably had an air injection pump. All that stuff is generally gone by now to get it to run better & get better gas mileage & make servicing easier.
Any capped off vacuum outlets probably were for this system. If you have vacuum to the dist. & any accessories like A/c & heater controls or power brakes, that is all you need.
I can find a diagram if you really want or need it.
George
