I agree with juvela that a gs group would be appropriate for the bike. Works very well and isn't terribly expensive.
Is the BB Swiss? It will be a bear getting a period correct one. Either way, a Magistroni crank would be cool. Weinmann rims from the era are typically wood-filled, rare and expensive. I have a single, late 60s Weinmann rim that is not wood-filled and the decal is nearly exactly the same, you could get those instead to save a few bucks.
Should clean up real nice.