First slant, multiple questions

There is no vapor canister on a '69. That carb is a Holley 1920, a '70-'72 item. The short hose coming off the top-front of the carb, that's the bowl vent. It is presently teed into the PCV valve hose that runs to the valve cover, which is wrong. It would ordinarily not be teed into anything on a '69 car, because it wouldn't exist. Carbs through '69 (California) '70 (49-state + Canada) had the bowl vent open to the atmosphere. Remove the bowl vent hose and discard it, then repair the cut in the PCV valve hose so that it runs from the carb to the PCV valve on the valve cover without any other stops or tees.

Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download.

Tune-up parts and technique suggestions in this post.

You will want to do the Fuel line mod and eventually the HEI upgrade . Other upgrade info here.