Collector ? Flange ?

You may be right, but.... my big block b-body super comp hooker adjustables definately have the seven and eight tubes thru the wheelwell, and your seven and eight look just like mine.

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Edit: they are SUPER comp headers, so hooker went out of their way to make the primaries equal length. In order to get enough length on the shortest rear cylinders they went thru the wheelwell and around the front frame rail, .....at least on mine. Yours may be different. Ive never worked on a mopar smallblock.