One small thing you can do to help with ignition is to "index" your spark plugs.
Before installing spark plugs, use a marker pen to mark a line up the insulator to show the position of the spark plug grounding electrode (the bent arm bit).
Install the plugs and see where the marker pen line is, it is best if the line is facing towards the inlet (and better if between, in the middle of the inlet valves), as this will keep the rich fuel mixture from flooding the centre sparking electrode.
Indexing can be done several ways:
One way is to get a bunch of spark plugs, mark them all on the insulator and test fit them for position. Use the plugs that line up correctly with the inlets and evenly across all 4 cylinders.
The other way is to use 'indexing washers', these space the plugs, allowing the electrode to face the correct way. NOTE: This method will change the depth of the plugs in the cylinder by whatever the thickness of the washer is in comparison to the other plugs. That is: all 4 plugs will probably be at different depths due to the difference between each washer thickness.
The benefits of indexing are minimal but if you want perfection, this is one factor.