That is a good start to your project. What will the machine shop be doing? Will they hot tank the engine? Did you pull the freeze/drain plugs and flush the engine and brush the orifices out?
i go through the passages with coat hanger wire and brake loose stuff off. Look carefully down passages with all plug out. Make sure bores have opening between them without a rust scale bridge.
The blocks i and others have done this to seem not to have overheating.
these new epa hot tanks don’t work well. And these have 40+ years of sediment. Plus a lot of California people don’t keep up changing coolant sense it never freezes here. And as result there no anti rust in the mixture.
