64 Barracuda Fresh Air intake

Your leaks might be rust around the "tophat" part of the air intake. Remove the plastic/fiberglass air ducts inside and get up in there with a good flashlight and have a look, or look from the outside. Pop out the little oval plastic plugs in the firewall area and have a look with a mirror. If they're rusty and you are going to fix, you must cut open the cowl and weld in new metal, or patch somehow. You can use new "tophats" made for a Mustang.

Look here -> http://www.stripmasterspor15.com/car022.html

Your wiper pivot seals are another culprit.

To replace the rubber gaskets around the rim of the air vents, I used some foam rubber stuff I bought at Canadian Tire (in the US try Lowes or Home Depot or maybe the auto section of Walmart or something). I used the same stuff but maybe a bit thinner for the taillights. Read all about it here -> http://www.enbcom.com/discus/messages/394/242.html