You need a lil more than square or you will have a tip-in sag or hesitation, as the carb transitions from idle, to low-speed pulling; or even just from neutral to in gear.
So after adjusting the transfer slot to the square and trying to adjust timing to get up to idle i counted the number of half turns i made on the idle speed screw to get it to idle. Then tried adjusting timing more and backing off the idle screw to get it back to starting postion, but cant. I am about a turn past the top of the transfer slot.