[rotorwrench]

That is certainly a flywheel for an 11-inch clutch and appears to be installed correctly. The photo of the clutch pressure plate model number is hard to tell whether it is 11CF or 10CF but if it bolts to that flywheel then it has to be an 11-inch. I would want to test that clutch pressure plate to see if it will release properly. The 11-inch Long type is big so it would likely be too big to test it in a hand operated arbor press. With hydraulic, it would be hard to tell how much pressure is applied but if a person is careful it could be done. It should compress easily. Another option would be to send it to your favorite clutch rebuilder and have it gone through. That flywheel looks like it could use a skim off of it too. Might as well start out with good surfaces.