intake(can that be called "intake manifold" since the fuel is injected?) & the '83 parts car has a butterfly. The same is true for the plastic unit on top of the valve cover('83 has it, '77 does not). Will someone please clue a newbie diesel owner in....

One more - why do they have a pump for vacuum when I am cautioned to not try to stop a run away by placing my hand over the air intake(I read that you can lose body parts!).