[Jamesp]

Having done this before. First off you have an oil filter that protects the journal bearings. Assuming it works (mine did) there won't be metal in the most sensitive parts of the engine which are likely pretty worn anyway.

1) remove the oil pan and the filter - you'll have metal debris in there if the IMSB failed, if you do,

2) Take out the plugs and scope the tops of the pistons. If there was valve contact replace the engine. If no valve contact:

3) Set the engine to zero timing remove the transmission. If you do not set the engine to zero timing and remove the IMSB cover plate the valve springs will move the cams and valve timing will be lost, you're hosed at this point.

4) With the transmission out and the engine set to zero timing (can't overstress zero timing) remove the IMS bearing cover. You have a single row IMSB, if you see a snap ring, you could replace the single row with another sealed single row. Make sure it is fully sealed as you will have loose metal in the oil and that will take out a bearing in short order if the contaminated oil gets into it.

Likely you will see what looks like a bad welding job in the counterbore that holds the bearing under the IMS bearing cover. If you see this the Intermediate shaft needs to be replaced and that is a full engine teardown. Get a new engine unless you're up for adventure.

This post won't be popular, and to be sure it does not follow the cultural norms of the forum but it makes sense as the engine is what it is. If you can breathe life into it with an inexpensive bearing some clean up work and a couple of quick oil changes its worth a shot.