Timing for start up

I hook up my timing light and crank with a starter button and set timing before it starts. Don't have to unhook vac advance couse there is no vacuum before it starts. Usually have to fill the carb with fuel and like oil pressure before it fires anyway. If electric fuel pump, don't turn it on. Big blocks call for 5` but I think you could start at 10`. BTDC Depends on the advance curve in your distributor. Then you just have to adj idle mixture and set idle after it starts and break your cam in. Then I check timing one more time when I am finished. Have had way better luck this way and they fire right up. Will also tell you right away if your ignition is working. Most engines do not start well at 30` unless you have a start retard in your ignition box.