I've been running modern Keo "Classics" on most of my C&V bikes and had been very happy doing so.
I could look for, and install early LOOK Carbones, PP76s or period Mavic derivatives for maximum period conformance, but the salient chracteristics of clipless LOOK pedals have not changed since the first ones, were sold that I think, running the LOOK Classics is more than just acceptable on most mid 80's C&V builds. I would also think it would be safest to use the new pedals Instead of ones from the 80's as their release mechanisms would more surely work as intended, compared to old LOOKs that might have mechanisms compromised by deteriorated, contaminated lubrication on internal sliding surfaces. Just like one might not trust old bindings on downhill skis.