Just make sure to check all the lugs for any cracking. The head and seat lugs are the ones that sometimes crack on these bikes. A good check of the lugs should be the first thing you do before you start buying stuff to rebuild it, as it will determine if you can even ride the bike.
Be careful when you tighten the seatpost clamp so you do not over tighten it, which then causes them to crack. Also check all the cable guides and cable stop at the chain stay to see if they are damaged (crushed or cracked.). They are quite fragile and sometimes gets damaged just from the bike being moved around. If they are damaged, do not fret too much as there are lots of fixes you can do with clamped-on stops and guides available out there.
Good luck with your resto-rebuild of your Alan, and keep us posted on your progress!