Sorry this doesn't answer your question but you could crank the engine with the cap off to check rotation direction.
edit for more info.
Looks like counter clockwise it is.
http://datsun1200.com/modules/mediawiki/index.php?title=Ignition_Timing
Does the distributer turn counter clockwise? (I have a good spark) My fan turns clockwise so does the crank pully.
Manual says ignition timing is 1 3 4 2 ? I am getting gnarly mufler explosions.