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Yeah, probably best to start a new thread. The 8.3 and 250 are completely different beasts. But the HE551V's electronics is just a speed sensor. Unneeded for any retrofit.

It's a S400 variant. The HX40 is a 19cm housing on the exhaust. Hopefully that S400 has a smaller housing like the stock 40 so it'll spool better.

Properly sized sure. Flange size doesn't matter until you get into big numbers. And yes a turbo can be mounted anywhere, with issues.

Stock usage (stock fueling/boost) they tend to survive just fine. Start asking more out of them, they give up the ghost in a hurry.

There's a lot of 40 failures out there. I've stayed away from the 40 intentionally due to their shared HX35 shaft size. You could buy a "boost elbow" to increase boost pressure. This simply reduces the pressure sent to the wastegate allowing for higher boost. That'll help squeeze a little...

You can of course push a turbo with more fueling to achieve more power. But a 40 isn't the best sizing for a 8.3 out of the box. It has a T4 foot. The problem you're going to run into trying to push the 40 is EGTs. Especially under load. Cummins specs the HX40 to 280hp, which is...

That's determined by the turbine housing. If you're hoping for performance from a 40 on a 8.3 you're starting off on the wrong foot. People put 40s on 5.9 Cummins. But more often end up swapping to a better turbo. What is your power goal?

Best answer I can give.... "One of those".

There's several flavors: 6 blade = 56/86 or 60/86 7 blade = 60/86 8 blade = 58/83 or 60/83 7 blades with the extended tip are the "best" 40 out there. If there's such a thing.

HX40's are inherently weak due to their shafts. (Same as a HX35 only with larger wheels)