Well... It really depends. The 224 is a small cam for a 6.0, but it won't need much of a stall. A 2800-3000 would be plenty for it behind a 6.0. I'm not sure if you have a stall already or not. But you can still get pretty good mileage and you won't hit 400 hp... but it'll still be fun, reliable, and a good family ride.