can't id bellhousing

This was installed in the '70's. It was a 340 with an 833. Before I try to sell the whole lot I'd like to know whose it might be. It's steel, has dual bolt patterns, had a bronze 4 puck clutch and the Z-bar pictured attached to factory pedals. Chroming was done back then and I couldn't find any numbers on this (but the original owner/customizer apparently spent a lot of time smoothing parts before chroming, my 489 rear only has a pentastar left on it)Thanks,
Keith

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