Please Help vacuum diagram 76 Step Side

[GreenChevyStepSide]

Hello! I'm posting this post for my brother who inherited our grandpa's '76 C10 Chevy Step Side with a rebuilt 5.7L 350 small block 4 barrel. My brother is the second owner after our grandpa passed.

Someone about 6 months later stoled the truck from outside my brothers house and was found in a chop shop with most of the pieces gone. We have been putting the truck back together ever since as the front end was all sold off and the motor was all disconnected but still there.

To make a long story short, what we cant located is a vacuum diagram for a '76 as we can only find one for an '77 which seems to look different that what is actually under the hood right now. If this is all original (which it is) possibly the '76 has its own diagram? If anyone would have one please send me one! Any PDF shop manuals or anything!

I have included the only picture I have of the truck before it was stolen and stripped... its in the background and green as can be (Original color).

[GMC Guy]

where in the bay area are you? i live in livermore, and might be able to help ya out