Originally Posted by Col. Brain
Manifolds can be changed but im pretty sure the engine mounts are the same so it should in theory "drop in"
As for just the engine - you will need to have it tuned. You will also need to convert it to a wet sump system (Mast Motorsports sell their LS7s already converted).
I am sure there are a few other things but yes I would think you could do the swap under 20k. So for about 50k you could have a 427 1LE
The price I gave with the link is just the engine. There's more you'll need. Total cost of the engine with wiring harness and dry sump system ready to drop in, is around $16000. I'd keep it dry sump instead of converting it to wet sump. That's just me tho. It'd be much easier for a wet sump configuration and if I'm not mistaken, you can swap the las3 oil pan onto this 427 along with a few other things.