Originally Posted by repechage

In 1975 of course, the clincher options were slim, Weinmann concave, Super Champion mod. 58 or Araya, all no hook.
I would hunt down some raw finished Mavics From a bit later with a hook cross-section as it does not read like you are trying to be period correct, but do want to appear reasonable.
Before you finalize the tire choice, measure the rear tire capacity.