Disc Brake Spindle tolerances and repair [not kingpins]

[scskysc]

So I'm in the middle of getting my disc brake conversion on and the donor spindles are a little worse for wear.
My truck is a 1970 F250 2WD Camper/Explorer and the donor is a 1976 F250 Camper? Both are 8 lug, but the '76 has 1.05 Kingpins so no easy piece together from one to the other. Doh!
It looks as if someone at some point destroyed a wheel bearing or two on the spindles.
Not only is the middle of the nose dinked, but the actual bearing surface is gouged up also.
I don't know maybe someone removed the previous bearing with the claw from a claw hammer.?.
At any rate should I:
1 - Machine the surfaces and hope to find bearings to fit
2 - Scrap them and look for another set
3 - Go watch Frozen, "Let it go" and just install new bearings on them as is

Assuming #1 is the correct answer the RTFM question would be are the machining limits available in a manual somewhere for my machinist to work from?

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[scskysc]

A trek to the local Pick-a-part failed me, but there was a '68 with a full disc set-up ready for the picking.
Since I had already scrounged a later gen set-up I'm sticking with it.
I got some leads on dead stock and already have one spindle on the way to me now.
Time will tell if the replacement is the correct part.

[scskysc]

Bearing Manufacturers state in their engineering documentation that the Tapered Roller Bearing has an interference fit.
The tolerance of that interference fit is based on a number of factors, but it boils down to this:

In the Case of automobile wheels, a circumferential load is applied to the outer ring (rotating load on outer ring) and a spot load on the inner ring. In any case, for a spot load, the interference can be almost negligible, but it must be tight for the bearing ring to which a circumferential load is applied.

The interference fit to the spindle can be almost negligible (0.0000"+ 0.0002"), but for the interference fit to the hub needs to be more snug.(0.0005" / inch of diameter.)
But it's to be considered that a loose bearing fit to the spindle is not acceptable as any movement of the bearing could produce debris(fretting) and/or heat that will lead to premature bearing failure.

So what do I do with the spindle that is obviously worn down so much that the bearing cone spins on the spindle?
Since it's a negligible interference fit it is acceptable to use a high temperature glue like Loctite 641 or Permabond A1046 to secure the bearing cone to the spindle.
An alternative (if you have the spindles with the 1.781 snout) would be to have a machine shop turn down the spindle to the next bearing size and use the matching hub/bearing combination.
Consideration needs to be given for the differences between single piston and dual piston caliper spindles along with the correct rotor hub assembly to mate them to, but from what I have investigated the bearings are available.

I have done a bunch of parts cross-referencing and physical measurements between all of the parts I have, but since I don't yet know all of the relationships between each model of F250 1967-1979 I'm not going to waste space posting random bearing set tables.