I'm running a RCI 15 gallon aluminum fuel cell in the bed (
http://www.jegs.com/i/RCI/821/2161A/10002/-1). I went with that because it comes fitted with sending, return, and vent ports. It sits between my driver's wheel well and front of the bed so I really haven't lost any bed space. If you go with something like that you'll need to make sure you order fuel line adapter fittings. I bought the Sniper Master Kit, which came with its own inline fuel pump (
https://www.holley.com/products/fuel...s/parts/12-920).
I ordered all my stuff from Chris at efisystempro.com; he's got great customer service and will know what you need regardless of the setup you go with.