Likewise, Welcome to the site! Congrats on your project truck and your intentions to restore it to it's days of glory. With that said, I'd like to admit that I have made a cottage industry out of buying "projects" that were running when the PO bought them....torn down and never completed. Most times, it was because the new owner under-estimated the time, money, equipment and expertise involved in bringing a "project" to fruition. If you're short on any one of these ingredients a complete tear-down might be the first step towards frustration and ultimately, failure.
You didn't mention if the truck was running/rolling. I would highly recommend that you start from the ground up, literally, and evaluate exactly what you've GOT to do to make it a safe "driver" first and then work on the esthetics after you're sure the truck is sound and worth the effort. You mentioned a disc conversion which, in my estimation should be mandatory...but to do the job right you should take a close look at the entire system...lines, hoses and other components and realize that bringing up the entire system is both expensive and time-consuming. If you're equipped to fabricate and run your own lines, plumb in the various valving and bring the system up to 100% it becomes a green light situation. BTW....double the time and dollars you've figured as a cost factor. This process should be repeated with all the systems in the truck; body, brakes, electrical, engine and drivetrain.
I know from personal experience, that it's easy to sink $10K and a thousand hours into a "non-show" project truck. It's better to have a true picture of the time, expense, and to honestly evaluate your degree of expertise, before you start ripping it down. The STOVEBOLT is a great place to get help but ultimately, when it's all said and done, you're going to be the guy that brings it all together. I hope this helps you get started on your project!
Dave