I had the same problem. I own a "69 Fastback Barracuda. I had to climb into the trunk and close it completely with someone outside. then I had my helper shine a powerful flashlight along the seam (rubber seal). If you do this at night or in a closed garage it works much better!! I saw some gaps that I had to address. Then, while I was in the trunk I noticed that the trunk trim piece is held onto the trunk lid using holes that go into the trunk area. I used Dum Dum to putty the backside of the holes. Also there are weep holes on the bottom of the trunk lid (I guess to let water drain) I plugged those also. Then there are supposed to be seals where the bumper mounts up against the body (This is really close to the exhaust pipes).
After fixing all these leaks I can drive everywhere without smelling like exhaust when I get out of the car!!!!:blob:
Hope this helps,
Treblig
