The term "hybrid" has been used quite loosely over the last 3-4 years. It only pertains to the heads ... not the LIM/UIM setup.
3.0L block + 2.5L heads = hybrid
3.0L block + 3.0L "port matched" heads + 2.5L UIM = Full 3.0L w/ 2.5L UIM
All you need to know is that anything above the heads can be switched for another with some slight modifications to things like vacuum routing and EGR tubing, but the heads are what makes it a hybrid.
