I believe that Isuzu used pretty much the same mounting format for the 2.3 as the 2.6, so it's still down there. My 2.3 has it hanging low on the driver's side, easily the lowest accessory on the truck. There have been those who intendedto/have moved it to the stock location of the smog pump, but I don't know if that applies to your old truck or not.

James