The problem with Northstars is when they overheat they can be ruined very quickly. No overheat, no problem. I keep an eye on the engine temp and basically run the piss out of it.
The more I learn about this engine, the more impressed I am. 300hp and 305ft lbs from a 4.6L and gets 26mpg on the highway. Not fun to work on but with some research, it's doable.