Help! My '86 is currently flooded and I was going to try the famous three step process. Bought new NGK plugs and now I have two boxes of "Leading" and two boxes of "Trailing" plugs sitting here in front of me. What are these things and which ones go where? You're right, I checked the plugs that are currently in the car and the numbers don't match the NGK plugs...

Thanks in advance for any help.

 

Looking at the car from the driver side the first farthest left top plug is trailing one and the top farthest right is trailing two, the farthest left bottom is leading one and the farthest right is leading two.