Mine is an AC cab,with a non ac unit installed.Looks like the only thing different under the hood is a piece of metal above the box where the heater wire runs through.The rest of the bolt holes were the same.
The heater core in hte non AC is in the same place as the evaparator in an AC unit,and the heater core is on the inside of the cab on an AC unit to compensate.
You can prolly get it to work if you use the AC heater box on the inside.