You're looking at nearly $10k all your prices added up. If you have some mechanical ability a good used low miles LS package can be had for under $2k if you shop around. Saw a 5.7 and a 5.3 local to me. One had 70k and with trans and transfer wanted $1500 the other had 88k with trans and transfer with a light knock and wanted $700. That's another $300 or less in lower end bearings and a crank inspection and you'd just need wiring and ECMs like the Stand alone kits from jegs or summit. Or you could do your own Cummins swap. Or fairly soon maybe a Mercedes OM606 turbo diesel swap. Or if you can wait until summer when I pull my 1fz for my Mercedes swap you can buy it. Or see if @shocktower still has his for sale.