I've read that book by Corky Bell. It's not bad, but as you said, would be alot better with current technologies written into it.
I'm currently reading "Turbochargers" by Hugh MacInnes. It's a pretty good technical book on matching turbines, housings, compressors ect. I'd definitely recommend it.
Shame the VNT turbos aren't used a little more. I'm also a little surprised as Garrett seem to offer this on their GT series turbos. I'm defintiely going to look into it as it seems like such a good solution if serviced properly to provide the reliability required.