To legally race its wing-nosed Charger on NASCAR’s superspeedways in 1969, Dodge had to build at least 500 street-legal versions first, whether buyers wanted one or not. This Daytona is one of just 503 built to satisfy that rule, and one of 433 fitted with a 440 instead of the Hemi. Some viewers say it is more than any ordinary muscle car deserves to be called. Here is why the rule that created it still matters.