Those are tandem cranks alright, you can tell from the chainring adaptors. Up until 1977 Paramount tandems came with TA 10 speed tandem cranksets with the timing chain on the right. Someone needed room for a 3rd chainring so they got another right front arm and installed it on the rear on the left side, and swapped the front arms left for right.

Our '77 had a straight sloping top tube and a Campi crossover triple. Even though it was a piece of crap, there's something about them that still makes my heart race. At least our fork crown didn't fail. (Not while we owned it anyway.)

BTW The OPs is an earlier model and should be OK. Almost every '78 and '79 fork failed due to inadequate penetration of brass between crown and steerer.

BTW2 Wouldn't work with Look, but I've known people with SPDs who just turned their cleats 180 instead of swapping axles.