Mosin,
You need to be prepared for runaway RPM, no oil return, or bad sounds, so waiting for the float bowl to go dry is no good, if you are in a hurry, you couls hook a clip wire to the point center post and have it at the ready to touch to earthn like the primary case.
Be sure to have the oil cap off so you can observe return.
Let us know how it goes.
Richard L.