Good luck with your $100 "get it running" budget. It appears that the mechanical fuel pump has been removed and blocked off - indicating an electric pump somewhere in the system. You may need a new pump after 20 years of sitting. However, since the seller said it ran perfectly 20 years ago, you're probably good to go.
At a minimum, plan on changing all filters, all fluids, a few hoses, spark plug wires and distributer cap, probably a brake cylinder or two, I could go on. Having done this after my '71 Z sat for 15 years, I could really go on.
Good luck with the process and keep us posted. Always nice to see another '71 back on the road.
Dennis