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I can say that most people have issues with installing the self locking windshield seal. Let us know what you find out.We sell the windshield gaskets also: http://store.73-87chevytrucks.com/merchant2/merchant.mvc?Screen=CTGY&Store_Code=7&Category_Code=WTHR
You know how hard it is to find someone to install a windshield correctly in one of these trucks? Now think about how many millions of windshields were replaced on these trucks back in the day. Goes to show how weak society is... I digress. I use the locking strip gasket, plus it gives you the option of the chrome or black look.
There is also a tool for installing the locking strip