You can't tell if it's a Commando/Charger engine without looking at the pistons. Same block, crank, rods, heads. Domed pistons, different cam, and of course intake, carb, distributor, valve covers.
Do you have a photo of the domed pistons for a commando engine? I can put a spark plug and look. Attached is photo of complete engine. Did not receive the distributor.