It would work the same series or parallel so long as the same cylinders are paired together. It is hardwired, so if there is an error in the firing order you cannot simply swap around plug wires. It does not take much power to drive the coils.
Its looking like this is a tuning issue, the engine is running lean.
I will get you the tune file tonight, but it will require work for the bigger injectors. For simplicity's sake if you have the original injectors that were in the lost package, I would use them. The tune will need adjustments still though.