This Book (David Hardcastle, Tuning Rover V8 Engines: How to Get Best Performance for Road and Competition Use) is very very Informative, well written and detailed. Don't expect to carry out all works though, without any technical know-how!
Nevertheless, I enjoyed it thoroughly and read it several times. If you have any interest in this V8 engine then you will not go far wrong!

When a book you purchase specifically to allow you to tune the Rover V8 advises that "cylinder head porting is a very skillful job which is best left to experts" and then recommends some such experts, you have to wonder why the book was written.
This is backed up by "to give full information would fill a book" - certainly not this one!
If you are happy paying the price for an engine overview, feel free, but don't expect any engineering data or David Vizard style information or to be able to use it to actually tune an engine to give more power.