I think I can answer that from a engine builder stand point.
Irregardless of whether you use studs or not it likely needs this operation anyway.
It's too your benefit. Old blocks move around and take a set, not always in the right place either. Now that it's stable doing the main bores will make it a better than new block and will stay that way.
Dave Koehler
http://www.koehlerinjection.com