Thoughts on salvaged trucks

[kwendt113]

After deciding against a gas chugging Gen1 for a DD, I've been looking into an LS swap and was wondering about the economics of purchasing a junker chevy truck to pull the engine/trans/pcm/harness and maybe a couple of other parts... then selling the rest.
1. Is it worth it or should I go to the junkyard?
2. Does the sale of the rest of the unused (but usable) parts typically off set the cost enough to make this purchase worth it?

I like to idea of having the donor truck in my garage to pull parts from and not have to go to the junkyard and pray.