2nd fuel pump.

I have a new Carter strip pump hanging on my 340.
http://store.summitracing.com/partd...4294908110+400415+4294840100+115&autoview=sku

I also have a pretty much new Holley red pump in the spare parts bin. Should I use the red pump near the tank in conjunction with the Carter or should I just skip the electric and keep the mechanical pump ?