There is no need to set the timing for the distributor by marks, as you can reposition the distributor rotor to satisfy timing needs. That said, I would have the rotor pointing to the #1 plug wire with the engine at TDC. That means the keyway for the crankshaft pulley is at the 12:00 position. That should be close enough to get the engine started to set the timing using a timing light.
tom