New Engine won't turn over!! Help

I'm almost ready to start my freshly rebuilt 340, did the preoil yesterday just to try it out. I was really surprised how much resistance builds up against the drill once the oil pressure rises, so much so the drill stalled.
Anyway it did the trick, could hear the oil bubbling through the system, will do again just before I'm ready to try a start.
Any idea how much the distributor drive gear rotates on installation?
Want to make sure I get it set up right at TBDC on #1.