That is our 86-87 IC engined PS pump. With the FWD reservior. There is a reason we have remote PS reserviors on our cars. There aint room for the pump mounted jobs. I think all you need to do is change the flow control valve and you're set. Most if not all FWD cars use rack and pinion. BTW you can find millions of those pumps in the boneyards. Used on everything from Cavaliers to Cadillacs.
Edit. You could always buy a reservior straight from GM and add it to your stock pump. You just need to buy the adapter to replace the hose nipple on the pump. You might look at the oreintation of the stock pump to make sure that nipple is pointing in the right direction. You could possibly mount that tank sideways by mistake.