Boguszow-Gorce Poland
For a start: your grandfather was born in the German Empire. In Gottesberg-Rothenbach, to be exact. Google where the catholic church books are located today. You might also be successful searching the available online databases of the civil registration records.
From another:
[Moved from]: Im going to Biecz Poland, where my grandfather Andrew Ignacy Guzik was born
please email me if you know of any Guzik living in this area of Poland
jjguzik@cox.net