It's only 256 pins to desolder and resolder, how much could... no, wait, that is a pain in the arse. I suck enough at soldering I need to take a break and go breathe into a paper bag for a while after doing one IC.

Silly question: Are you putting in sockets, or just soldering the chips down? Obviously sockets wouldn't be original, but they're totally worth it in every other way.