The 168s should shoot OK in the 1-in-11 or 1-in-11.25 barrels that are the norm for FALs. I've got a 1-in-10 on my Mauser, and it handles everything very well. My FAL with the 1-in-11.25 is best with 150-ish grain bullets, but will handle the 168s. It doesn't like 175s, while the 1-in-10 bolt gun is awesome with them.
I don't have the Greenhill formula saved anymore, but if I remember right, the break between 1-in-10 and 1-in-11 was around 160gr. Best of luck!
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