Hi I am looking for a vacuum diagram for a 1984 Chevyvan30. It is a one ton g30 engine--350 v-8 with a Rochester 4 Bbl carburetor. Also, when I am looking at the diagrams online, there is no legend to let me know which lines I am looking for. They show solid black lines, white dotted black lines, and white lines (outlined in black). Which are the vacuum lines? Thanks for any help.