Does your truck drive the way it always has, but your injection pump leaks now? It's very typical for the seals of the rotary injection pumps on these 1990 plus diesel landcruisers to dry up at some point and need replacing. I've had to do it to both of the Toyota diesels I've had. It doesn't mean they need rebuild at all. And as I wrote near the beginning of this thread, new seals are only about $50.
If your injection pump was dying, you'd have different issues. They get super clattery, your truck would have a hard time starting, be super smokey, low on power, etc. Even if this was the case, you'd send the pump only out to a specialty diesel shop and have it evaluated with quote before proceeding.
The bulk of the work is getting the pump off the engine, and back on. Most of the job is fairly straight forward though. Between us all here we have the tools you would need for removing/installing and re-timing. Or you could just pay Marigold to do that work, and ask to deal with the pump yourself. I could help you seal it if you want. It just takes a couple hours.