If the cowl is leaking, the wiper seals may not be the problem or at least your only problem.
If you are sure, it's water (not antifreeze), then it could be condensation from the AC box if it's not properly sealed/drained but more likely, you have had some of the seam sealer come out of the joint between the firewall and cowl allowing water to leak in.
Does this water appear after a rain storm, or just from driving, after A/C?
I would take a good look inside the cowl area (pull the vents) and feel around if any of the seam sealer has dryed up and cracked out. You may just need to reapply some new seam sealer to seal it up good again!
Try looking up Detrout Muscle Technologies (DMT). They sell a lot of these random gaskets for Mopars. I have dealt with them and had a very good experience.
If they don't have yoru gasket yet, you may be able to mail them yours and they will send you a repro! They helped me out on one of those.