Power Steering Pump differences

I'm trying to find the correct pump and reservoir for a conversion I am doing. The big question is do I need the new or the old style Saginaw pump/reservoir. I am going to use Classic Industries part# MD2675 bracket for an LA small block to a Saginaw pump but I'm not sure which pump will fit. I am also ordering the hoses for Saginaw to Mopar (MN7508) and a conversion steering box for 1962 to 1976 (MN7505). Can anyone point me in a direction? This is for a 1964 Dodge Dart SW with a newer LA 360 and a newer K member (though the K member shouldn't be a problem since the box is 1962 to 1976).