Small block idler pulley

str12-340 said
for 1970 small blocks there are an entirely different set of pulleys and belt pairings for AC cars and non-AC cars. In that system the AC and alternator run on a double belt. Did you car actually come with AC and no power steering - I don't think I have ever seen one like that before.
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I don't have any paperwork for this car, so what it came with originally is impossible to tell. My dad owned the car for 15 years or so and was like that when he bought it. It is possible it was converted to manual steering for header clearance, I don't know.