Joe;
Am I correct?
If you use a nhra/ihra sanctioning approved "sealed box" vented to the outside, as in the Moroso #74050 or equivalent, you do not have to seal off the trunk behind the rear seat and package shelf?
This type of box must be secured to the car in the same manner as you described.
http://www.moroso.com/catalog/catego...?CatCode=42001