this is a second attempt i don't know if the previous thread went through. Nonetheless i am looking for help i want to swap my 5.3 to a 6.0 for additional torque for pulling purposes i have a z71 4X4 2005 and have acess to few car yards where i can find a fair 6.0 for a the going rate. are there differences in wiring harness fuel etc? Any help would be greatly apreaciated.

get a 02 and newer 6.0 and everything bolts on, just get a tune so it will run right..

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would ls6 heads and intake still wire right up to the factory wiring harness in the same situation without wiring mods?

yup, as said before the search helps, tons of info already on here, all the gen III heads will bolt right up and wiring is the same