I also say do NOT throw anything away. I did with alot of my parts and had a hard time finding a few pieces that are not reproduced. Also, GM parts fit ALOT better than repro, so try to use GM as much as possible and your budget allows.
Also like Charlie said, you will forget how it goes back together if you leave it for too long. It's always good to have another car to look at, or somebody to ask if you need help.
Another vote for at least doubling your budget. (especially if you get ideas from this site

) You will also find alot of new surprises once your car is media blasted.