I have been running a Holley 5200 for several years now and had no problems with it at all. As long as you get one from a car that is about 2.0-2.3 liters it will run great. If you have problems with it you either don't know what you are doing or your truck has other problems.
The holley 5200 is not based completly off the DFEV or the DGAV it is based off a combination of those and the 32/34 DFT which was Webers "emission friendly" version of the DGAV. It featured places in the casting for car manufacturers to machine in additional devices as they saw fit.
As for a book, I've been working on one for the last 9 months. The manuscript is currently about 6 chapters and 180 pages and I still have 7 chapters to go.
I have some information on the holley 5200 and weber installation on MazdaTruckin. Here is the URL:
http://www.mazdatruckin.com/B2200/B2200.html