All necessary machining processes apply.
Decking is necessary, not because you or anyone is looking for zero deck height, but because generally speaking, they aren't square. I haven't had an old or new block yet that was perfect. Usually one end higher than the other or something minor like that so even just a mild cut is needed to square things up.
For that process to be done correctly, the main saddle has to be perfect, so that is checked minimum and sometimes needs addressed. Then your typical bore and hone to the size desired.
When dad bought his MR1 block, all this had to be done.
Don't recall needing any modifications to the oil or water holes at all. Believe it was used just as it came in that regard.
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