Need help running new fuel lines

[jmark06]

I'm getting ready to plumb up my turbo engine in my 77 280z and need a couple of questions answered. I've searched and figured most of it out, but want to make sure. I want to use 6 AN braided from the tank, to filter, to pump, to filter, to rail, to regulator, to return, to tank. I measured the tubes coming out of my tank the the top one is bigger than the bottom one. I figured the bottom would be the outlet (to the pump) but it's smaller, I think 5/16". The top is closer to 3/8" or 7/16". So which should I use as the outlet? Secondly, do the AN to tubing compression fittings from Earl's work well? And finally, what tools will I need to put everything together, I've not worked with AN fittings and hose very much? Thanks for your input.