Ok everyone, the big block vs small block debate is ridiculous. Obviously most of you don't know much about engines. The term came from the physical size of the engine, not the displacement!
And if we want we can give the triton motors 3 designations, the 4.6 is a small block, the 5.4 is a big block, and the 6.8 is a bigger block. The physical size of each engine is larger than the next!
Regarding the 7.3.....I've heard rumors that it is set up for DI and forced induction. So it may have more power in the future.