The price you've given for a Rochester B rebuild kit is very high compared to what's I've found ( all less than $50 online ) If your Rochester is not leaking fuel between the air horn and the float bowl then you've got a keeper. I suggest you contact Carbking at The Carburetor Shop ,
https://www.thecarburetorshop.com/ , and ask about a rebuild kit . (573) 392-7378 (9-4 Mon-Tues central time) .