Yea, you can use the stock lines up to the heads.....Your looking at a new fuel pump...one form a SD truck, fuel regulator, fittings, new lines for the regulator and for feed... highly recomend a FWS if your gonna eliminate the fuel bowl. It works like this.....run tap into the lines at the top of the engine, The feed line will need to be T'd off...so you can feed both heads. The return side (front of heads) needs to be plumbed into the regulator....then back into the return line.
As far as plumbing into the tank supply...I tapped into it after the tank selector switch. The filter set up will have to be plumbed in by tapping into and out off the stock lines, if you choose to use them.
I ran all new line #6 wire braid... but I had the line laying around to use. Also had to change the fittings in the rear (feed) of the heads. I picked up the fuel supply after the tank selector....I made my own bracket to mount the fuel pump and filter on.
Fuel flow..... from the tank, thru the selector, into the filter, to the pump, into a FWS, to the heads, out the heads into the regulator, into the return side at the tank selector.
Eleminate the fuel bowl, and remove the stock pump. Use a freeze plug to block off the hole in the valley from the stock pump. Easier on you if you remove the turbo.
Its alot to do, more than I figured....I changed over due to lack of volume to feed my stage 2 injectors. Its a good setup, just time consuming. I wouldnt do it unless I was planning on running bigger than stage 1 injectors in the future.