Nothing to stop you from plugging the plug the other way inside the dizzy.
As for aligment if most defo is NOT just a case of gapping, to 0.2-0.3mm as you say, when the engine is at tdc(no1) the rotor arm trajectory must be bang in line with the scribe mark on the top of the dizzy outer lip visible once cap is removed, imagine the line the arm would point the mark should be dead centre in this, even 1 tooth out will cause havoc, with consequent chronic overfuelling, you wouldn't be alone made that cock up myself as well, my fave is trying to start cars with no rotor arm as it can't be seen missing with cap on when working on the older types that used these.
tabetha