Greg We certainly know how some English speaking person can mangle a Slavic surname. All one has to do is look at an US census so why would church record be any different, right. One would think that if it was a "Polish" nationality church with a Polish roots priest that the spelling would be much correct to the Polish grammar.
Have you seen your ancestors' headstone? Sometimes some of our Slavic ancestor's would put down a correct spelling of their surname.
I did not find any TAMBURSKI surname holders in Poland. Here is what I found using www.herby.com.plBAMBURSKI, SAMBURSKI, SIAMBURSKI, STAMBURSKI, SZAMBURSKI.
Can you follow Victoria's mother paper trail especially her marriage if it took place in USA?