My toyo truck has 197k miles and I am looking for some things that I may be able to clean up or refurbish to restore some power.
I.E fuel injectors, etc

Any ideas?

 

Run some seafoam through the intake and a timing chain, valve adjustment/inspection/replacement and a water pump, plugs, wires, cap and rotor.

 

I just cleaned my valves by taking th head off and scraping and sanding the crud off the valves, new stem seals to reduce oil consumption. Seafoam will not remove that crusty build up, I tried. My mileage got better, my noisy engine got quieter, and the new timing chain cover and all helped make it even quieter.
You could line the inside of the doors with sound deadening and your vehicle will feel newer.

 

How do I get to my valves near the cylinder heads?

 

you will have to pull the head off and diss asemble it, at whitch point i would to a full valve job. grind the valves&seats put the valves in a drill press and scrap the crud off. new valve seal will make a world of difference, they brought my camry back to life, it has guts again!

make sure to clean the intake and tb while thier off!
you can also scrape crud off the top of the pistons when they are at TDC

probably the best improving thing you could do to it.