Josh,
I am so sorry to hear about your Dad. His car was important to him, but in his earlier posts you can clearly see how proud he was of you. So first and foremost, please accept my sincere condolences on the passing of your Dad.
I think finishing the car for him, in his honor and his memory, is a fantastic thing. I believe there is no other person than you he would want to have that car, and know he will be right beside you when you are working on it and eventually in the driver's seat.
Please let us know what you need from a knowledge, parts and advice standpoint, and we will be glad to help out. I have a 1970 Road Runner, so many parts and elements are very similar. You will find that assembling the car can be a challenge, and I will be glad to share the many pictures I took of my car's disassembly. Of course, I will be glad to help with whatever else I can as well.
Rock on Josh!