And one more thing, stop believing what sellers tell you!
The moral of Harisuluv's advice is that after enough time and experiences with these 40 year old bikes, most know of all the unannounced problems, the service neglected issues, the ham-fisted PO screw ups, the hidden treasures, and the aged petrified components. Unless a bike is in "restored" or "renovated" condition, expect it to require 2-3x the purchase price for it to be safe, reliable, and enjoyable.
If you have limited experience with bikes, then plan on months of troubleshooting and tinkering. If you are planning to chop/cut/rebuild it, then buy a bike in any condition you feel comfortable with. If these bikes are uncomfortable to you, then you should buy a different brand of bike.
Oh, and stop believing what sellers tell you....