Answered February 27th, 2020

Norm Van Brocklin had 554 passing yards when scoring 5+ passing touchdowns versus the New York Yanks on September 28, 1951.

500 or more passing yds and 5 tds in a game by a qb
Interpreted as:
500 or more passing yds and 5 or more passing tds in a regular-season game by a qb

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