I've only used one Indy block myself.
When I talked to Russ about exactly what the block needed for machine work do be "done", one of the things he said needed to be done was that it would have to be decked.

The way it is in the OP's pic is what I would assume is what you get when you buy an unfinished block.

I had Indy do all the machining operations on the block I used.
I checked all the dimensions and they were all good.

All I did was thoroughly clean it and put it together....... No problems at all.