[October-1881]

I don't know if this is the right place to ask, but could someone get me up to speed on hardening valve seats. I'm not an engine guy and I would like to know what exactly happens if the seats aren't hardened and non-leaded gas is used for a long period of time. I'm looking at a '66 Mustang with a 289 that has 80,000 stock miles on it and thinking about driving it + 2000 miles home.
Thanks