http://lexington.craigslist.org/pts/4358063883.html
http://cincinnati.craigslist.org/pts/4410841928.html
http://cincinnati.craigslist.org/pts/4403401979.html
http://cincinnati.craigslist.org/pts/4369959968.html
I am on my third LS conversion. One of each size 4.8 (FJ) 5.3 (C10) and 6.0 (K10) Each time it has gotten progressively less expensive but nowhere near 3K yet. You guys must have LS's laying around out there. I would love to see it done cheaper. Good luck with your swap.
Yup That link as well as a few other ones on LS1tech and some other sites are where I started and borrowed the knowledge I used. BTW he does those conversion for a living and finding $450 LS's at least on this side of the US is not that common without them having some unforeseen issues. My 4.8 had a spun bearing and journal cracks that necessitated a new block. So my $600 engine turned into more then it should have. Like I said It can be done for cheaper and my buddy and I as we flip these trucks are getting better at it but we just can't get the engines and trans that cheap. At least not in so cal.