First where do you reside? in the USA?

Yes, you want to replace your torque converter no mater(scored or not-just mileage I would replace it) what you do... Even if you buy a used tranny. The reason is on the 722.6 and 722.9(same torque converter) it is has frictions in it and they just wear-out..

Those bushing bearings are a must too in your case...

On any rebuild of 722.6. The must is:

A) torque converter
B) bonded piston
c) front pump bushing
D) rear stator bushing
E) Rubber seals/teflon seals(in rebuild kit)
F) All frictions replaced(all sized to appropriate gap of .7mm to 2mm depending on the spec for the clutch pack)
G) circular external connector replaced

This is a very easy transmission to rebuild

My opinion 200k is the limit on this transmission before hard mechanical damage occurs..Not that the whole thing wears out at the same, but the lower gear frictions just wear out faster because we are just on them more, and they are at the back of the transmission.

Martin