Siwinski/Dudek family in Poland begining in the 1800s 2. In Progress

I am trying to find information on Multiple great grandparents. On my father’s father’s (Felix Phillip Siwinski) side;

Leon (possibly also Louis) Siwinski. Born somewhere around 1874 possibly in Kleczew, Wielkopolskie, Poland and immigrated to the USA around  1893.

Katarzyna Kowalski (wife of Leon, went by Catherine in the USA). born around 1885 in German Poland to Tomasz and Marcyna Kowalski. She immigrated to the USA with her parents around 1892.

On my father’s mother’s (Mary Dudek Siwinski) side;

Matway Dudek, born around 1886 in Russian Poland. Married to Apolonia Sienkiewics  (or Szynkewicz I have seen both spellings) born in 1888 in New Jersey, daughter of Joseph Szynkewics (born around 1848 in Lisow, Lubin, Russian Poland) and Rosalia Kochanski (born around 1851 in German Poland).

I feel a strong need to trace my Polish family roots and to learn everything I can. I have hit dead ends here and the information I have found seems questionable at times. Any help would be greatly appreciated. Thank you.