from my understanding....The "factory" efi is a horse of a different color?

The heads are vastly different from any performance head on the market, especially in the intake area, to make provisions for the injectors.

Are you intending to make any performance modifications?

The E4OD is huge, compared to anything else. To find a comparison, it makes the C-6 look like its sitting next to a C-4. You willl have to modify the floor pan, count on taking out the transmission hump and reshaping a good deal of the tunnel to accomodate the thicker body shape. Its a great transmission, after after the 94 - 95 versions has proven to be fairly robust, but except for a few internal parts (5 gear planetary) it has little in common externally with the C-6.

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..."The truth is that there is nothing noble in being superior to somebody else. The only real nobility is in being superior to your former self...” --Whitney Young