If you're really determined to run a twin-turbo setup, here's what I would suggest: as long as you keep the boost under 15 psi or so, the stock rotating assembly should work just fine. However, I would suggest using ARP head studs as an added degree of measure. Also, you can install an MLS composite head gasket/spacer to drop your CR down into the more boost-friendly zone of 8:1 or so.
I would recommend using slightly smaller turbos that make abot 6-7 psi of boost (each) to keep turbo lag down and increase bottom-end responsiveness. A couple of k14s or T2/T3s would work great and are plentiful in the scrap yards. While I'm not too familiar with the 3.0, you could probably weld a flange/adaptor to the stock exhaust manifolds and run them. Along with a decent amount of port matching, deburring and polishing you could probably make some decent power out of them. Or, you could take the plunge and fab up some log-style exhaust and intake manifolds for a truly unique and one-off setup.
My buddy is running a ginormous, single air/air FMIC on his twin-turbo Buick GNX and it hauls ass. I imagine you could get a similiar setup to work on a twin-turbo 3.0, but a lack of underhood space could (and probably will) become an issue. As others have mentioned, you will need to address the need for increased air and fuel in order to get everything working right. You could also run SEM (like megasquirt) but you may be better off getting a custom tune burned for you in the end.
I could go on and on and on, but I think you get the idea. Good luck with whatever you choose and be sure to post lots of pics!!!