Jim,the low speed mixture is set by engine speed.and performance.
Start the old Gal and let it warm up to temp.
Turn the mixture screw ,engine at idle, in slowly until the engine starts to lose speed ,than turn it out until the engine starts running rich .
Than turn it back in until you get a nice idle.
the two turns out or 1 1/2 turns out for the screw are only starting points.Each engine carb combo are different a little.
Pete
