No.
The L codes designation is for 440 High Performance engine in 1969. It would be a Magnum engine in a Dodge. As an option on a convertible likely less than 5% of total production.
I believe you could order a standard 440, or 440HP in a Polara convertible.
I do not think the engine option, and option production numbers are known for convertibles in 1969 for Dodge.