..........One last question and we put this post to bed, Is there a book out there on big blocks similar to Bob Mannels book on small blocks that I could study.
Not the same size or to the same wide depth but there is a specific 428CJ manual that focuses pretty much just on the engine. Nothing out there for the 390s.
Consider also just not focusing on the engine as there are allot of other parts that make up the car that can make it a good or bad deal.
Good luck with your search - there does seem to be allot (well a fair amount compared to other times) of big b lock cars for sale (67-69) And there is always a ton of 69 428CJ - just have to weed your way through allot of them to find the best one for you