318 vs 360 schumacher mounts

Can someone school me on 318 vs 360 schumacher mounts.
I think the ones on my 65 are wrong.
It has a 318...the passenger bracket has 4 bolt holes when the 318 block itself only has 3 bolt holes on that side.

The driver side has 4 bolt holes, yet the bracket on that side only has 3.
Car drives fine, has plenty of clearance, etc yet wondering if I have the wrong brackets on there.

I doubt they are on the wrong sides...any info?