Welcome to the fold. Pierce prices and in fact all collector car prices have spiked over the last few years. Personally I’ve never had much faith in the accuracy of value books. I think you’ll learn more by watching the market and networking with other collectors. 65K for the car you mention is along the lines of what many are asking for similar cars these days. Weather or not they are selling at those prices I can’t say. Ultimately the value of anything is what someone is willing to pay and the owner is willing to accept.
As to E-Bay, I would strongly suggest before purchasing a car of 1960s vintage or earlier you or someone you can trust look the car over on person.
Good luck on your search,