Wikipedia claims that Feynman's first job after Los Alamos was at Cornell for $4,000 per year (~$54k/year inflation-adjusted). This claim is repeated in many sources, including the book "Genius: the life and science of Richard Feynman".

That book also makes the claim that in the 1960s (perhaps as early as 1960 itself), Feynman's salary crossed $20,000/year and that he was the highest-paid member of the faculty. Inflation-adjusted, that is at most $165k/year.

I don't know, but "Surely you're joking, MR. Feynmann" contains an anecdote about a bidding war between Caltech and another university, at the end of which he turned down an even bigger offer in order to be at Caltech.