My cousin is a mechanic at a local Chevy dealer for about 14 years. Once in a while he comes across a turbo on a v-8. Usually its a Lingenfelter corvette, but also someone brought in a 1990's Chevy truck with a "high altitude" package. It's a turbo for vehicles driven at high altitude, probably from Denver. I don't know if it was a factory install or dealer install, but it looked stock and the owner said it was there since he bought the truck new. This turbo was a "ground normalizing" turbo, basically to keep you from losing power at altitude, not to gain more power than stock. Just another example of v-8 with turbo, they work great and can be used however you want to use them.
I'm a fan of using one big turbo, not twin turbos. Not only does it cost more for two, but the peak output is usually less with a twin setup. A lot of times with twins, one turbo is designed to make power at lower rpm, the other at higher rpm, but you aren't getting power from both at the same time, and you are using small turbos so the volume is less. With one big turbo you get massive volume throughout the power band. Only problem is turbo lag on larger turbos, which can be dealt with and still worth it when you look at the dyno.