I've been in the Bonneville world for over ten years now having owned, parted out, fixed and sold over a dozen of them. I've been out of that for a couple years now but recently came across a 2001 Monte Carlo SS and a 2005 Buick Century.
Long story short, digging into the Monte Carlo more and more I'm going to walk away from this one and sell it, just not worth the work it needs to be a good driver. The Century is super clean and only 109,000 miles on it but has been sitting for six years after blowing head gaskets. The work has all been done to replace them as well as heads were checked and milled before I bought it. Now I just have to finish it up which isn't much, belt driven accessories, upper intake etc...
So, I am tossing around the idea of keeping the drivetrain out of the Monte and swapping it into the Century as well as building a nice L67 for it. I'll be looking for a more specific section to get into detail but that's what I have planned for now.