What would be the power curve differences (other differences as well) between a 224/224 and a 224/228 cam? lsa, engine, etc all remaining constant for both.

 

I have gathered from others that symetric intake/exhaust lobes can enhance mid-range torque. Conversely, the extra exhaust duration lends itself to more top-end power. Of course you didn't state anything about what LSA or ICL you were looking at, so all is subject to change.

 

The second one would better compliment some nitrous as generally nitrous likes higher exhaust duration.