I have to wonder if more severe oil consumption is indicative of problems beyond the valve guide seals.

In my case I was clearly burning a lot of oil, judging by the blue fog that surrounded my truck on offroad trips. I had the valve guide seals done. Unfortunately, in my case it did little to reduce my oil consumption.

About six months later, I went ahead and replaced the heads with Clearwater heads. This took care of the problem completely. I do not know if there is a way to tell if doing the guide seals alone is not enough, but it is something to consider.

Since you say you want to keep this rig running for another 100K you are probably going to need to replace the heads at some point. It is a much more time consuming job but you could probably do it yourself and be more sure that the engine is good for another 100K.

Some may disagree but it is at least worth considering.