According to the usually reliable
Pro Football Reference.com, in 1961, George Blanda threw 36 TD passes (line #17 in the attached document), leading his team to the League Championship and breaking the record set by Johnny Unitas' in 1959 (#45 in the attached document). In 1963, Y.A. Tittle tied that record (#17 in the attached) but did not lead his team to the NFL title. That record stood until Marino's 48, about which we are in agreement.
You are correct that my original post should have read "League Championship" and not "NFL Championship" in that one paragraph. But, in case you're just arguing a technicality, Blanda is regarded as an NFL player and his record is commonly regarded as a League record as a result of the merger. Denigrating his 1961 record is the same as denigrating Peyton's for the reasons proposed in this thread. Blanda is among the top 5 QB's ever to play the game in my book and his records are very, very real, whichever League can claim him as its own at the time.
Here is the link to Blanda's career, showing that he played in the League until 1975 and also showing that he threw 36 TD passes in 1961, bolded in the text to indicate that it was a League record at the time:
George Blanda NFL & AFL Football Statistics - Pro-Football-Reference.com
If my source is wrong, please provide me with a link that demonstrates it to be so. Here is the link to my data:
NFL Single-Season Passing Touchdowns Leaders - Pro-Football-Reference.com.
If you prove (!) me wrong, I will write to my source and correct their error, which would have to comprise multiple and systematic errors across a very large data base, but is possible.
On a personal note, I work with data all the time and teach statistics at the Grad school level. I have learned that I can always be wrong, but that I need to be respectful of others when I think I have them on the facts. It's a lesson you would do well to learn.