Absolutely, you need to install the torque boxes front and rear (lots on here about that as well as a lot online). You can purchase them or you can make them, then weld them in. You also want to install inner fender braces which can be purchased or made, I recommend a solid lower radiator support as it really stiffens up the very front of the car. Some people make/buy tower supports (the kind that new cars have/use that are above the intake and run from shock tower to shock tower) but I personally don't really like them because they get in the way of about everything; I think the inner fender braces and the lower radiator support will suffice.
Not sure what you are going to do with the rear suspension, however if by chance you use something that requires the rear shocks to support any of the weight of the car, the rear shock cross member must be upgraded as it was never intended to do that.
Be very cautious of a number of the after market systems such as the front K frame and some rears suspension systems. There are a number of them that are horrible and despite some people claiming they are "ok", the truth is far different. You need to understand how they all work and what happens during use. For instance, there are a number of front K frame systems that use adjustable coil over shocks to adjust the front end height that bolt into the stock upper shock location; this area was never designed to take the weight of the front end and over time will flex, crack and perhaps fail completely. There are other systems which replace or significantly reinforce this area and thus are much better. Personally, I prefer the factory style front end components; they fit and work without issue but don't look as cool as the coil over stuff.
Good research, careful thought and analysis will help to make this a very enjoyable experience; notice I didn't say cheap..
You don't always have to buy the latest and greatest stuff on the market, but there are definitely times when you need to spend the money to get the best product (Headers come to mind, TTI is the standard for fitment).
I don't know if you are planning to do this yourself or shop it out; if you are doing it yourself, depending on your skill set it might take longer but will be far more rewarding (plus you will get to buy a lot of cool new tools), if you are going to shop it out, understand that the vast majority of "custom" shops do not know or understand Mopars and could make a cool project into a horror story rather quickly. I do all my own work so I cannot recommend any shops but what I would say is find someone who knows Mopars well, get recommendations and talk to previous customers.
Lastly, start a thread on here under "Members Restoration Projects" (mine is 73 Road Race Cuda). You can (and should) ask questions, post pictures, etc. There are some awesome builds on here that will cover about everything you can think of. Also, there are a number of very active members who are doing their own work and can help you with detailed information.