As Italcarlos points out the chamfers are fine. So perhaps it is salvageable.
Who did the work on your block - removing studs etc is way way beyond my pay scale.
In the end anything is fixable but not necessarily economic (a bit like my entire project 😂. 75 engines are getting hard to find unless you want to buy the whole car! Perhaps I will let it sit on the shelf for a few years for my next (Giulia Super) project
The engine block and head work including stud replacement, crank machining, head shaving, valve and guide work, balancing,.......etc was done by https://balmainengineering.com.au/ in Sydney.
As for the engine coater, he’s one of those old school chaps who works for a race team and does this on the side with no web links or willingness to share his know how, unfortunately! Plus I utilise Evans waterless coolant to eliminate any further corrosion.