The FAA doesn't do a conversion on CPL licenses. If you meet the requirements for a FAA CPL(H) (150 hrs. min), you have to do three hours of training with a FAA CFI and he will endorse you for the checkride. You will have to take the written exam as well. The CASA CPL(H) requirements are a 105 hours for the CPL as I believe (not sure 100 or 105) that's the ICAO minimum and the FAA minima are thus higher.