Pretty sure it would be like my 70, with no idler . . .just the belt on power steering pump going round the ps pump and the water pump and the crankshaft.
Here is pic putting engine into car, just did not have the fan and pulley on water pump . . . that is all there is for the ps pump and water pump. This pic shows missing triangular shaped bracket that goes behind front bracket of power steering pump. Should be behind the bracket with adjustment slot - finally figured that out !!! Doesn't matter if saginaw or federal ps pump . . . still need the small triangular bracket that mounts to water pump and adds support for the slotted adjustment bracket . . .
Cheers