I would lock it out so it stays at one specific timing setting or have the mechnical advance set to be all in at or a bit lower than you stall speed.
I run my timing locked out at 28 deg advance, runs like a scalded bandit.... if you have a aftermarket ignition a timing retard device helps get it started. High compression and 28 degrees will work the hell out of your starter - definately get a hi-tourque starter.