i did this about 2 days ago... not much of a project... the only thing that is tricky is finding the right one and making sure it fits right...
pretty much, it looks like you can just attach the power actuator to the existing latch, but that is mistaken... you need to find the entire assembly and it will more than likely run about $50 at the junk yard ( i got prices between 45 and 80 from different places, ended up paying 50). usually the hardest part of finding it is actually opening the trunk... if they have the keys still, that's cool, but if not have them get a portable jumper and give power to the car and try the trunk release in the glove... (if it works, you know you're golden, if not, you still probably can use it, just find another way of opening the trunk). You can't use the assembly off anything other than an intrepid (or maybe an eagle vision) te concorde's lock cylinder is offset and thus has a different mechanism to physically open the latch.
when you have the part, it just unscrews with an 8mm socket and you need to make sure it has no rust. well a little on the latch is ok, but the little metal strip where the white plug goes can't be rusted or else it won't work...
when you take yours out, look at where the screw was set in the metal and try to use that as a guide for how to screw in the new one... for a really good fit, screw it in about 85% of the way, just enough to nudge it around a bit and close the trunk, then open it and tighten the screws, that will ensure a good fit... also before you do that you might need to activate the actuator to open the latch, cause it might be in the closed position, making closing the trunk a bit hard.
all in all it took me no more than 10 minutes to do the whole thing and i can post pictures of the old assembly and the new one, as-is and taken off. i seriously love the thing now though... it makes the most wonderful sound when you open it...