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Looks like you guys beat me to everything. The OP is wanting the change engines, not components. It is very do-able though as many guys have done it. If it were me though I would call Stu and let him give you some $$ numbers.
He didn't change engines. He just upgraded from the old ignition system with plug wires to the newer 06-up wireless set-up which is called the 6.1L conversion. He still has a 5.7L with a bigger cam, and 6.1L pushrods and valve springs I believe.
That isn't called the 6.1 conversion, its called 06 and up coil conversion. If you were to say 6.1 conversion to me, I'd be looking for that engine under the hood.
Someone about 4 months ago gathered all the parts together and then decided not to do it, so I got all of it reasonably cheap (just haven't gotten around to installing it...)