I picked up the official authenticity guide to the 68 hemi dart and the 68 hemi barracuda on
amazon.com and it is the very best book I have ever seen on these cars. It has every spec for building or identifying these cars. There is so much information in this book it will blow your mind. Every question you could have can be answered reading this book. Probably the best $20 I have ever spent for the wealth of knowledge this book has to offer. I would highly recommend this book and I have to a few people. The best thing about it is if you don't feel this is not the best book of knowledge, you can always return it, but I am willing to bet that you will keep this book in your Mopar library for many years to come. I do not believe you will return it but keep it at arms length always just for the knowledge.