The head your asking about it the cylinder head krtcummins. The heater core hoses come out from the core tubes and one goes to the passenger side of the truck and into a black tube heading I think towards the pump or thermostat. (I didn't look) The other tube goes to the cylinder head on the passenger side about 2/3 of the way to the rear of the head. It sticks straight up and isn't hard to find. The heater hose goes right to it and all of that is very open and easy to see when you look in there.
The dash cover on mine is the "agate" color and matches the rest of my truck. I didn't ask about other colors once I talked to them and determined that the color was good to go. It cost me about $430 IIRC, and no freight as it was a stock order. Here in Alaska the freight sometimes can cost more than the part.
Any screws in any power port door shouldn't need to come out to get the dash to come back. All the wiring under the dash is loose enough to move with the dash assembly when it comes rearward. As a matter of fact I didn't take any wires loose on my truck under there except the gauge pillar wires and the heater blower wires. I was replacing the blower motor anyway but otherwise it didn't need to be unhooked. Oh, and the glove box airbag module hookup came out.
The instrument cover bexel just pops right out but you might need to tilt your steering wheel down to wiggle it out of there. Mine is cracked too so I priced it. IIRC it was $360. 00. I have too many numbers in my head right now. Too many things to fix.
Like everyone here has said numerous times, TAKE YOUR TIME. That's with any job really though. But when I had my dash pulled back, if I pulled on it just right, it came down a bit and bumped the 4X4 shifter lever. I heard some ominous cracking noises a couple times but still cannot find anything broken. It'll likely manifest itself in 3 or 4 years when every body part on the dang truck is obsoleted.
Its very easy to crack this plastic on these trucks, must be whatever they used to make it with or something, maybe the UV rays. ?? Who knows, but be careful. Though the job sucks, its a lot cheaper to do it yourself than have a dealer do it. The dealer will likely not even tell you if they break, crack, scrape, scuff, ding, strip, etc, etc any parts in there. They most of the time care about the bottom line and the next sucker. I know, some dealers are awesome and all that and I am not bashing them but it happens. i said that to say this: if you do it yourself, it will be done right and you'll be proud of your handiwork. Good luck.