1966 Dodge D/Dart ~ 'Mystery, Myth and Misconception'
Alan,
They could be OK Kustom Headers {Flint, Michigan}.
They were fabricated with 'Large Primaries'.
And, they were notorious for improper bends. They hit everything and did not
fit worth a damn.
They do not look like the 'fenderwell' Hooker Headers my Father had on his 1967 Barracuda 273.