Short answer : Yes, and it works as advertised.

Longer answer: There have been several threads about pre68Dave's adapter and I don't recall anyone saying anything negative beyond questioning whether it was more effective to use the "short pump" or the adapter plate. His instructions do point out that you will need to drill and tap a couple of holes in your block. He is also clear that you need to use the 41-54 pump (two large holes in the pump's back plate) not the 37-40 pump (single large hole in the pump's back plate) and appropriate pullies. In other words, if you follow the instructions you should be fine.
It is possible to make a similar plate for the 37-40 pumps but bolt placement is touchier - unless you need the 37-40 pump for some special reason the 41-54 pump with pre68Dave's plate is easier.
Pre68Dave is a member at Stovebolt and provides sound advice.