66 Newport PS Pump

So i've had work done to the power steering pump on my 66 Newport. One thing the mechanic mentioned to me there seemed to be a bolt "missing" on the bracket that mounts to the block. Currently, the pump wobbles and vibrates more than I care for it to so I took a look to see what he might be talking about. The photo is taken from underneath the car, looking up at the underside of the PS pump. You can see a threaded hole on the block so i'm wondering if, at one time, there was a long bolt...

66 Newport PS Pump
Author: 5fty7vn