[StingRay]

As I understand it the 73-87 body style box is a bolt in. I'm not sure what year the fittings changed to metric though. I've used early non metric fitting boxes in my trucks before. The pump/pulley/brackets will be for a long water pump and our trucks when stock are a short pump. I'm taking a guess but if you had the brackets and pulley from a 67-72 the pump itself would probably be fine.