You get a better pull on the fuel with the throttle full. In this case I would prime the engine ignition off. Then once the engine is primed, close the throttle to a fast idle and start This kind of start brings flooding into play for many. You can choose which thing you deal best with.
If I know I have flooded an engine and it will turn with a Hi torque starter, I run the starter at ignition off full throttle and let the engine clean and prime like that. Works great.
Oh, this is an ignition with mechanical advance right?