Hi, and welcome to our little corner of the world. You have a great boat. I am, however, sure that when you bought it you recognized that you were changing worlds, perhaps not as drastic as from a rocket ship to a VW beetle, but you get the drift. When we had our C22 in the '80s, we used to race against a J24, but it was never really a race even with handicaps in PHRF (also fun Lake races).
The obvious things to look for are the condition of the sails. You don't say how old the boat is or what condition they are in.
That said, the C380 has a plethora of sail controls and one of the things that Catalina has always done right is to provide very good sail control hardware (Garhauer) and beefy (wide traveler, good sized blocks, etc.).
Next step are the jib controls. Most folks I know "swear by" their Garhauer jib fairlead adjustment systems. You don't say how big your jib is, but if it's over a stock working jib (110%), that will appreciably aid in adjusting the jib fairlead when beating and outboard tracks on the "gunnel" help when going downwind.
Also, based on a recent thread on the Sail Trim forum here, do you have a complete set of telltales on your main and jib?
Finally, "what" were you racing against?
Those are the basics. What do you have?