I want to put an LS3 in my 2000 Silverado 1500. I have a 4.8 vortec right now, and hate it. The LS3 that I am looking at is 6.2L with 430 hp and comparable torque. I'm pretty sure the tranny is a 4L60. Headers and magnaflow are going on as well. The shop I went to wants to charge me 19k for parts and labor. To install a 5k engine with 1.5k exhaust and headers, I feel like that is ridiculous. Especially since the LS3 pretty much drops in with no other new parts required from what I've been told. How can I do this cheaper?