I recently had the same problems with my 72 Blazer only worse. If you have rot by the antena you should think about removing the windshield because water pockets beneath the gasket. All these areas can be repaired if you have the time. Its also much easier if you take the fenders off because the rot tends to creep behind the fenders. I had to replace the entire windshield frame on my truck due to perpetual leaking of the top. For sealing the cowl I used anodized aluminum screen from the hardware store. It works great. Just screw it to the cab with the cowl and windshield wiper screws.
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