I have found Conan to be one of the easiest games to convert into using a different non-d20 ruleset.
Aside from the setting info which is all within Road of Kings, the only other speedbump for conversions is Sorcery, which can be either hard or easy depending on what rules you wanna use.
Everything else is pretty simple and can usually be used as is. Races, you only need humans, classes, aside from the Scholar and Thief, everyone else is essentially a warrior of some kind. Skills are standard for most systems, same with feats and equipment.
I'm doing my own conversion for Savage Worlds and its a lot less work than I had thought.