I have an A body. A C/SA 1970 Chevelle. If you are using the stock suspension, you will have the A body lean.
My suggestion is to call Alf Weibe. He has the A Body suspension wired. I have been using his parts for seven years. His supension launches straight without any lean. I have seen others that have a straight launching car without his suspension. They are rare and require a lot of work. I wanted a perfect launch out of the box. He has really helped me make my car fast and straight.
The NHRA has lately been giving him a hard time. I understand that he has a solution that is acceptable to the NHRA tech department
Here is his email:
wiebemetal@shaw.ca
Rick Kagawa