is there anywhere else other than clifford to get slant 6 headers?

I can certainly understand (and enthusiastically agree with) avoiding Clifford. Depending on how far afield you are willing to go and what your intended purpose is (i.e., what-all is included in your definition of "headers"), you might check out Dutra Duals from California and Escapessilens from Argentina.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

What body style are you needing them for?

For the early A bodies Clifford is the only header available. For the '67 and up the choices open up a little.

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Official Cookie and Mater Tormentor.

I am currently working with Aussie Speed on Early A headers. Actually Headers for ALL slant models. Depending on how soon you need them....
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

Those Augentine headers look like they face the wrong direction

They're selling 6 cyl headers for different makes.

So I assume that's just an example.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes