timing cover and water pump confusion

Ok so we have a 360 with a drivers side water pump inlet, We need to swap to a passenger side to run the AC & other accessory drives we want. I know there may be a timing cover swap needed to but since we just got this car I'm wondering if they have a matching cover already, I know this engine was pieced together from a few small blocks by previous owner.The cover is aluminum the pump cast iron. The cover has the timing tab on drivers side. I can't seem to locate my timing light (been a long time since I've used it)to verify it's proper and the engine runs great so I wasn't planning on messing with the timing yet.

so did they make aluminum timing covers for both water pumps? or does the fact its aluminum narrow it to one? I'm not usually that lucky but I can hope.