Those are all great answers guys, but nobody ahs address the issue whether the engine is going to be running an exhaust system.
If that is the case, then you almost certainly will need to run a dual pattern cam.....with about 10* more.
A single pattern cam works great on a head with 80-85 % flow ratio as skip said, IF the engine is running with open headers, and the headers are "tuned" and correctly sized.
The exception to this is if the engine will be running NOS.
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