The 15,000 GVWR lines will not fit correctly, because unless you have leaf sprung solid axles and disc brakes and 19.5 rubber on 10 lug rims at all corners, you dont have the 15,000 GVWR. either I or the fellow member with the crew cab project HD can put them to use if the vendor does not offer returns.
I would highly suggest the braided stainless lines from Leroydiesel.com or lubricationspecialist.com If you want OEM lines, you better go to GM and order based on VIN number, and get new block connector fittings.
For turbos, Leroydiesel.com sells the A-Team Turbo, which is a all inclusive kit to make it a bolt on deal. PTwiringsolutions.com sells a kit to convert Holsets, such as HX35 and HX40, for use on the 6.5L.
Do not do marine injectors, especially if they are not genuine Bosch. Get stock output genuine bosch, either rebuilt by a quality shop, or new units from a reputable vendor. You gain fuel by changes to the pump, not the injectors on a 6.5L. for return lines, Leroy is selling OEM style, which seem to be the best. the aftermarket ones dont seem to seal for very long.
While its out and on the stand, I would put in timing gears (from Leroy)or a new timing chain and sprockets (rockauto) and re-seal the front cover and the oil pan.
Put in a new rear main seal, and the front (doing it anyhow due to removal of the front cover) and either a fresh AC Delco harmonic damper from rockauto.com or a Fluidampr from Leroy.
When sealing alot of things on a 6.5L, try to avoid gaskets, especially with the exhaust. on oil pan, valve covers, etc. the common route is "the right stuff" RTV.
If you are gonna be hot-rodding this, consider fresh head gaskets and ARP studs. I know leroy can get head studs, but IDK about main studs.
If going into a manual transmission pickup, make sure the valley drain tube is in place.
Once in the truck, make sure the starter heat shield gets in, as well as the front brace when you install the starter.
Otherwise, I think that about covers it.
Feel free to ask any questions, the only dumb question is the one never asked.
Good luck!