just an everyday "in-frame"
that is how semi's get most of their freshenups.
I did a rod and piston in my 300sdl 40k miles ago with the motor loose, cocked up but not out.
I even had a dodge truck that I had the rod journals turned while still in the truck.

heck I just remembered I put new rod bearings a piston a rod and a full set of rings in a f700 ford on the side of the road in Jacksonville took one afternoon to break it down and was back to work the next afternoon.

ahhh....done alot of rings in cars and tractors "in-frame"

if the mains are good and you have good oil pressure have at it.

country boy can survive,

dave