Here is a great one. I normally hang out in the 67-72 section, and they are really great people. But they have all sections in there. They also have a chatroom too. With Members: 11,847, Threads: 85,304, Posts: 705,922
you will probably find the answer to your questions http://67-72chevytrucks.com/vboard
Check it out. It is the only place I go for truck questions and answers.