There should be a vaccuum hose schematic on a sticker somewhere in the engine compartment.
get a chiltons repair manual from the library for 67 chevy's.
I have a 1982 cutlass supreme and the diagram in under the hood on a front panel, If not someone may have removed it.
long
The timing should be set to 10 degrees BTDC.
Without other modifications you will not notice the difference.
Probably about 10 to 12 miles per gallon..depending on whether you have a 2bbl carb or a 4.
165 hp stock 2bbl carb A lot of the pickups had a 4 barrel, which added 20.
In stock form it was 130-145 net horsepower @ 3200-3800rpm depending on the year. That's with a 2bbl carb and the stock 2.25" single exhaust.
16 psi
Assuming you mean adjusting the idle air/fuel mixture screws, it is best done with engine running, warmed up and a vacuum gauge connected to a manifold vacuum source. Start with screws adjusted 1 1/2 to 2 turns out. Run engine and adjust each screw several times to achive maximum vacuum at idle speed.
The engine makes--145 HP @ 3800 RPMs. STOCK. 305 CID 2bbl V8 (145 horsepower, 245 lbs/ft of torque)
a Mikuni solex 2bbl