shouldn't need to reflash anything, disconect the battery before anything and hook it up very last. In some ways they are easier than older engines, no timing to set, idle speed... but there are more wires to plug and unplug. I would check the dealer for a price on short block and or heads at least, if I had known I could buy a short block for my 2011 for $900 I would have been all over that but being an early one it may not be that cheap because they can't just pull one off the assembly line and hand it to you anymore but I could buy a pair of new heads and short block cheaper than a used engine, a little basic assembly work I could have had a new engine.

As far as actually putting it in and out of the truck I pull the bolts off the side of the block instead of the mount through bolt and I pull the intake off, just gives a lot more room and there is no water in it like the old SB. You can weasel em in and out with the AC still hooked up, just be carefull, I also like to pull the plastic wheel liners, I think it helps more on durangos than trucks.