Front Bumper, front air dam and radiator replacement

If the crash wasn't bad, sometimes it can be fixed with some sanding and Bondo... But that's a big if in most accidents sadly. My concern here is your radiator got hit since the front is designed to take the majority of the damage on unibody cars; that often means the foam in the bumper and crash bar tend to get damaged too. If it's really bad you often crumple in the strut supports now.

To give you an idea of why I worry: I have seen the strut suports crack in Hyundai/Kia vehicles as they use the struts as a part of their crumple zone. Toyota and Volvo pioneered this by breaking the wheel and crushing the entire area; the others followed along when IIHS gave both high marks on their crash tests; even Honda started doing it when it worked well for both. In addition to this, you almost always need bumper foam and a crash bar; they both get taken out in a lot of more major accidents; not so much in fender benders, but you lose the foam. DO NOT TACKLE THIS unless the car is worth more in scrap AND you're comfortable with more major front-end rebuild work unless you can absolutely tell! Some weld the crash bar in too (Jag is known to on classic Jags, but this isn't common; most use bolts; people leave marginally damaged bars in classic Jags for this reason).

As far as getting the parts, look on a Challenger that's been in a rear-end wreck at the junkyard; you can often get a deal on all of the front-end parts that way (crash bar, foam, bumper, and radiator/radiator supports). You may need to get the bumper repainted if you can't find an exact color match or the paint fade gives it away; if you aren't comfortable painting the part yourself take it to a paint shop and ask them what they charge to paint just a bare bumper. If you need to blend it it's usually just a matter of new clearcoat covering the bumper and a small amount of the original paint so it looks like it matches. It will never be 100% though.