i know you're not 16. I already checked. la de frickin da that its an LS. Its good you do your research...not enough people do. However, that doesn't dismiss the fact that engines and swaps are getting extremely hard to find here on the west coast. If you found a cheap long block on the east coast you'd more than lose you savings after shipping.
Again, good find. However... that's just the long block. Now you'll need a tranny. Look at their "long block" section. Why would they sell an LS engine for 750 and a LS complete swap for 750 too? Cause they don't.