If you did not build the engine yourself, more than likely you would have no idea where top dead center is. The best way to set the timing is as follows. When the car is warm, advance the distributor a few degrees at a time. After each try , start the car. Keep doing this until you have pre-ignition[car will act like the battery is going dead, and will be hard to start.] Now retard it until it starts easy, tighten it down and go for a ride. At about 30 miles an hour, press it to the floor. If you don't have pinging and rattling, leave it there and you will have set it to the optimum.
I have always set timing at factory plus 1 degree for every 1000 feet of altitude, plus about 2 deg for carb plus more for manifold plus more for cam plus more for headers... you get the idea. Or you could set it to achieve the highest vacuume.