5.9L, Melling HV pump, stock pan, dual remote oil filters

I might consider a standard volume pump unless the motor has a lot of clearance built in to it.
The extra quart that a second filter provides doesn't mean as much when there is no oil in the pan to pump into the motor. The thing I would pay close attention to if you are set on this is oil drain back......make sure that it gets back into the pan with out major pooling in the valley or the heads.
An accusump would be a Bandaid for what you want , but a deeper pan would be best.