I'm obligated to put in a plug for Strange Aeons! The stats can be converted relatively easily. Not a definitive guide, but with appropriate scaling I'd imagine STR -> A, CON -> Con., SIZ -> W, DEX -> Dex., SAN -> Res. would make sense. The only stat CoC doesn't cover is Movement, but you can generally class most things as slow (4), average (5) or fast (6+). Skills present a bit of a challenge, as most CoC skills are knowledge based, while Strange Aeons skills are primarily combat-oriented.
I should also mention having had considerable success in the past using Savage Worlds combat rules for CoC campaigns. Just substitute the "Guts" skill for Sanity and off you go. You can also use Savage Worlds for the RPG aspect of your game if you're looking for a pulpier experience than traditional CoC offers.