Skinny
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I don't want to sound like a 6.2 hater. They are fairly easy to work on in the CUCV application, parts are cheap, and pretty reliable when serviced/upgraded correctly.
Having said that, unless you are getting a 6.5 turbo setup cheap from a JY or Ebay, I do not understand why anyone would spend any money on upgrading a 6.2 to make power or performance. I would replace it with another 6.2 if mine died, I would consider an Optimizer if I had lots of money and didn't feel like doing a lot of fabricating for an engine swap. I just do not understand why someone would build a spared no expense 6.2 engine. You can be time/money/performance/mpg/reliability/etc. ahead by using something better to start with like a BT engine. There is a reason why many people like them. If a DT466 fit I'd be looking at that too. Even look at something a little less conventional like a bigger Isuzu or something. I would hate to see someone spend $10k of building a 6.2 because in the end you still have a 6.2
Having said that, unless you are getting a 6.5 turbo setup cheap from a JY or Ebay, I do not understand why anyone would spend any money on upgrading a 6.2 to make power or performance. I would replace it with another 6.2 if mine died, I would consider an Optimizer if I had lots of money and didn't feel like doing a lot of fabricating for an engine swap. I just do not understand why someone would build a spared no expense 6.2 engine. You can be time/money/performance/mpg/reliability/etc. ahead by using something better to start with like a BT engine. There is a reason why many people like them. If a DT466 fit I'd be looking at that too. Even look at something a little less conventional like a bigger Isuzu or something. I would hate to see someone spend $10k of building a 6.2 because in the end you still have a 6.2