I will second what air&road said, find a good machine shop. I have found a couple in my town that redo engines, and they do very good work. I usually strip the stuff to small pieces and drop off the engine in pieces and I get good workmanship back.

Depending on my mood and equipment I assemble it myself or have them do it. Two engines I had them redo were "quality replacements" from high name crate engine suppliers.

One machine shop I frequent has a mechanics shop attached to it so its a one window solution for most people.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)