You need to check that they are suitable for road use. If the cam says for off road use only you can expent the cam lobe to wear down more quickly than a standard cam effectively reducing the 10mm lift! Track cars are regularly stripped and rebuilt whereas we expect our road cars to stay together for years!
You can always get your existing cams reground to a more sporty profile. I think piper or Kent offer this service and I would probably go with Piper to be honest.
Have you thought of getting the head flowed and bigger valves whilst it is off the road getting the cams changed? A 248o duration sounds fine and shouldn't give a lumpy tickover
