I usually try to have #1 end up around 1:00-1:30 when seated.
That leaves plenty of room either side of my advance unit so I can swing it without bumping into my coil or thermostat housing.
I guess different engines might have a different sweet spot? But that works best for me.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.