Z24 with 8-plug engine
Firing order is 1-3-4-2
#1 cylinder of the engine is the one nearest the front of the truck.
on the distributor, LEFT wiring is 1-3-4-2 starting at the top and going down as you look at it.
RIGHT side distributor is exactly opposite, 2-4-3-1 starting at the top as you look at it.