Cool find!

Your happiness may depend on what you want from it. A restoration to as-delivered condition is probably not practical if you want to maintain your wallet and sanity. But a shiny complete-looking convertible cruiser with some liberties taken where you can't find the "right" trim parts, is entirely possible.

More optimistically, the '65 880 shared a lot with the '65 Polara and Monaco. Same drivetrain, chassis, sheetmetal, bumpers, front trim, tail lights. Not side trim. Interior is different, but it would fit if you switch it all over from another model (Polara/Monaco). Standard engine was a 4bbl 383 / 315hp. I found no production numbers.

Best of luck,
-Art

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