On the CDI, specify "Stanislaus". On the SSDI, click on advanced and specify last residence CA, death year 1977.
Knight's Ferry is a very small town name after a Mr. Knight, who ran a ferry across the Stanislaus River there during the gold rush. It is about 10 miles upriver from Oakdale.
I wrote to the Stanislaus Co. Genealogical Society on your behalf to see if someone will go to Oakdale to look for an obit. Frank wasn't in the Modesto Bee. I checked March 9 - 13. They didn't devote a lot of space to Obituaries in that era. The Oakdale "Leader" may have him.
In the mean time, you might want to spend $27 on his SSN application. Click on the "SS-5" link on the SSDI page, above.
There is one person named Drake living in Oakdale, according to