What's the difference between Ford's 6.8 and 7.3 Godzilla V8 engines?

Ford's "Godzilla" V8 engines are some of the strongest gas-powered blocks in its lineup. How do the 6.8 and 7.3 versions ...
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The rarest Ford pickup truck ever made was a convertible

Fewer than 20 of these oddball Ranger redesigns were built, making them an incredibly scarce sight on the road.