I've continued to search for leaks in the cowl area and have found a couple more. The worst was where the flanges of the side panel come together with the cowl and firewall. I had gone over all of these with seam sealer when the dash was out, but I never dug the old stuff out from between the flanges, just cut the gobs from corner. The main spot was right under the cowl drain. Resealed it with Blackjack neoprene this time. I checked it again after Really heavy rain and the side was good, but I think I have similar problem near center of cowl. I might try digging sealer out and replacing from the engine bay side if I can do it without trashing the paint.