Is there a reason not to put it in the rear closest to the fuel pump?
it seems the important wires would be shorter and you have a closer run to the battery
I've done fuel pump rewires in the past on other cars and I use the stock wiring to the pump to switch on the relay
therefore, on the BAP, you would only be running a vac. line from the engine bay
I'll be installing mine soon and will try to remember to do a full writeup