You can always go with long branch headers. I found a set on a '68 GP and swapped them over to my Cat. I also did the console shifter at the same time so I don't know about interference with column shift mech. If you do use CI long branch headers you'll need the oil filter adapter too.
I have read the the long branch don't flow was well as true headers, but they are an option.
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'68 Catalina convert. w/ 428, OEM long branch exh, QuadraJet, 3:23 Posi, GP front grille, GP bucket seats and GP tilt.
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