You're probably going to have trouble finding books on this subject. However, if you search the internet you'll find tons of articles. One reason you have trouble finding info. is that a different method or style exists for each vehicle made. An early model Ford chop is totally different that say a late 40's Ford chop.
Another good source is old book stores. Go in the oldest book stores in town and look for old Street Rod or Rod and Custom, etc. magizines and you'll find a gold mine in there. Buy them all! You can usually buy them for 25-50 cents apiece and there full of detailed information. Something that is lacking in today's magazines.

Good luck!