I bought several albums of old 78s from an estate sale that included a half dozen or so records with partial news clips and radio programs from the 1940s. I plan to copy them into mp3 files, but I was wondering what to do from there. Is there a preferred archive for these types of things on the internet somewhere?

I'd love to hear them. You can try here for hosting;
https://archive.org/

What about....

http://otrrlibrary.org

Not sure how uploading works to that site, but they sure have a large selection!

Both of the previously mentioned sites have info on uploading programs, and both are excellent resources for OTR fans. I've used both sites for several years and never any problems.