One the more technical and hot rodding side is
http://www.shoptalkforums.com
If you have any specific questions about what years let me know. I have been working on them for 20 years and am on my 3rd ACVW of my own. Currently I am building a '75 Baja Bug. It is a ground up rebuild including a Bug trans conversion. It has taken a year so far and it is almost ready to be put on the road.