this may be a dumb question but .what is the ball looking thing under the hood on the driver side .i know it has a vac line to it .i just changed the intake and carb off my 305 and now hooking lines back up .i think i got it right . distr vac to timed vac on (600 holley)carb ,pvc port on carb to pvc on driver valve cover ,trans vac and power brake vac on vac port on(edelbrock ) intake .now i just gotta figure how to set timing .was at home bored so i used some parts i had laying around