[mattfranklin]

BTW, beautiful truck! The good thing about these old Chevy trucks is that there are not very many vacuum hoses.

1) Power brake and TH350 take direct or "full" manifold vacuum. Typically some kind of port near the rear of the intake.
2) Distributor takes "ported" vacuum. I know where it is on a Holley, but not sure about the Quadrajet. Probably somewhere in the side of the carb.
3) PCV system (yes, you need it, it's awesome, and while it helps emissions, it helps you, too). Frequently it's a larger hose barb on the lower part of the carb (at least on a Holley). That goes to a 3/8" hose connecting to the PCV valve in a grommet in one of your valve covers.

Maybe not perfect, but maybe enough to get you started and then the other guys can shoot holes in my story where I've screwed up.