2 questions one carb one timing please

i have 73 duster with 6oo cfm edlebrock carb what is proper way to adjust with vacuum gauge, also i think my timing is off some, i have slighty built up 360 with the carb above, 3"hooker headers into dual 2 1/2" dynomax superturbo mufflers,pertronix ignitor ignition and flame thrower 2 coil,mild cam, my approximate hp is 370, automatic car. can someone tell me what my timing should be set at?any advice would be thankful
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