I just finished a relocation on my truck. I didnt get the Vulcan kit, but did get the Fass DDRP bracket. I also bought the fass DDRP pump, which I hope is a good decision. I suppose like any other thing, they will fail too - sooner or later. My wiring to the stock pump on the engine had already been spliced, so I just cut into the splice and added about 6 ft of 16g wire and loomed it in a plastic sleeve to the the factory connector to the new pump. I decided to to use rubber fuel line from the pump to the factory filter. Eliminates a couple possibilities of air leaks.
I mounted the bracket just behind the transfer case on the inside of the LH frame rail. There was a hole there that is just big enough to get my hand inside for the back-up nuts. When I bolted the Fass pump on, that flimsey bracket would vibrate - too much weight on too thin of metal! I could see that bracket breaking and dropping the pump down to the pavement. I used the factory bracket from the engine, which also covers the hole for the mechanical lift pump that isnt used. I used a chrome fuel pump block off plate for a SB Chevy, about $7 at O'reilly. Same bolt pattern.
I also didnt like that "thimbal" size fuel filter they send with the Fass pump. I ordered a spin on filter base from Napa (part# 4309) for about $45, which lets you run a BIG water/fuel seperator filter (Luberfiner FF2D) I drilled and tapped the frame for 5/16 bolts and installed it between the tank and filter. I can post a couple of pics if interested. I also did several other changes 'not in the book'.