Hi Enzo
The following may not be 100% acurate because it is based on the iron viper truck engine. the coil packs for the trucks were mounted on the leftside valve covers but the firing order should be the same. #1 cyl is left front
firing order: 1-10-9-4-3-6-5-8-7-2
the coil packs are wired [ 5 - 9 ]...................[1 - 7 - 3]
..................................[10 - 8 ]...................[6 - 4 - 2]
it is probably due to space availability that the coil packs are split up on the viper. both engines use the crankshaft as an ignition triger so the plugs fire twiceon each cycle.
I hope this is what you were looking for.
Carl