[750hp]

When you ask if the engine is "good enough" for a Cobra, perhaps you need to decide what you want to achieve.
If you simply want a cheap V8, you can buy a 5.0 out of an 86-93 Mustang for peanuts; same with any of the LS family that are pulled from GM trucks.
I think that the majority of Cobra owners would choose an engine other than a Vortec.