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My official answer to your question is "I don't know". I do, however, have mint condition examples of both the first and second editions. The date on the first edition is August, 1966. The date on the second edition is April, 1967. Yours is just on the verge of changeover. I recently gave one to a friend of mine that needed a second edition. I purchased five second edition manuals several years ago (mint condition with the cards) for ten dollars. I think they are starting to get a bit pricey.
Looking forward to seeing your 1969 L88 when I get to Chicago for Vettefest. Hope to bring CB, Stan and the boys with me to your place.
That's the same build date as my car. Coupe with 327/300, A/C, PG, PB, PS,
tele Wheel. I have an April edition for my car, though I don't think that it would be correct.