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I don't know positively for '68's and '69's but it is true for the '67's.
Remember, GM planned the L88 as a race car and discouraged it's use on the street not to mention that a race car doesn't need a radio or heater.
i believe i've heard of at least one C3 L88 with an auto trans although i may be mistaken.
There were some autos used in 1969 model year. The production data lists 116 L-88s and 101 M-22s in 69, so danthony is pretty close. I think 68s were all M-22. Heater delete was only in 67. I believe federal regs required heaters (for defrosting window) in 68 so they all had them. I think they were all radio delete, so no need for braided (shielded) spark plug wires or shiny ignition shield box.
68 and 69 have heaters and may or may not have a radio.In 69 there where some auto L88's. My buddy Tom owns a yellow 69 L88 that is auto. It was on display in the corvette museum for the 50th. It was in there for the whole year.