It depends if your 350 is carb or fuel injection. if carb then it depends somewhat on the carb and the year of the engine/car. different years had different emission requirements. basically you need vac lines to your dist, PVC valve, egr, air filter. others have commented that your local library has manuals but the net has info as well.
Vacuum hose diagram for 1959 chevy truck, wiper motor?
http://www.customefis.com/emissions.html
There should be a vacuum hose diagram on the front of the driver side strut tower.
If you look under the hood you will see a sticker with all the vacuum lines on it.
from a library
Want to sea foam my 2002 Chevy 2500hd 6.0 what vacuum hose do I use
I need a diagram for the vacuum lines on a 2004 Chevy trailblazer
You can find a vacuum hose diagram for your 2005 VW Jetta at your local VW dealership. Most local libraries will have VW service manuals with the vacuum hose diagram.
Having a diagram of the hoses in a car will help ensure that everything is properly changed and connected. The vacuum hose diagram for a 1986 Chevy Pick up v6 can be found in its maintenance manual.
The vacuum hose diagram should be on a decal somewhere in the engine compartment. jb
Look on the underhood sticker.
If you open the hood up and look around at all the stickers that are across the top of the radiator shroud, You will see one with the vacuum hose diagram on it.