Well if it is toast, it is toast, so you really have nothing to lose. On mine, the crankset/BB/bolts were all 1973. When it loosened a couple of times, I did ride lightly on it 1-2 miles, each time. After subsequent problems, I used a new set of bolts from an NOS Campy crankset I had. No more problems since (and it was the bike/crankset I rode on yesterday on iab's ride). And I have torn the bike down for a total rebuild winter 2013, reassembled with no further problems whatsoever.

If it were me, I would tighten the crankset quite tight (by 3/8" ratchet perspective), take it out for a short shakedown, re-check, take it for another short shakedown, and then evaluate. If the bolts feel like they are easy to remove, then remove them and torque them with blue loctite. I don't recall ever seeing torque specs for old Campy Record (NR/SR) cranksets, but I seem to recall someone saying around 20-22lb/ft, which if you compare to the old "standard" of tight with 3/8 ratchet, is quite a bit more force.

And I'm sorry you didn't get to complete the ride yesterday! Though you would have just been 1 more person in front of me