Frank,
Not 100% sure but I'm guessing that dual exhaust would be an option even a 4BBL Bonneville. Bonnevilles were 8 or 10 inches longer than catalinas in the trunk. A person wouldn't be able to put the Bonny side trim on a 62 Catalina because of the rear quarter panels being longer. If I remember correctly the Catalinas were 23 series cars. I don't know what the Bonnies were and all my Factory Pontiac service manuals are in storage. My catalina project is on hold for a while.
Terry W.
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