Oops, I lost a paragraph in my answer. My broadband is down because of an ATT wireless network upgrade that is underway, and dial-up is shaky.
After you get the pyrometer installed and the engine rpm baselined, remove the timing cover and the drive gear for the injection pump. There is a Woodruff key (half moon key) that holds the drive to the pump shaft. Replace that with one that is indexed so you advance the pump timing. The indexed keys are available from most specialty gear and sprocket supply houses (usually located in an industrial area and generally go by names such as Industrial Drive and Gear or such), or from diesel power shops that work on Bosch injection pumps. Pick up several different keys, they are inexpensive, and experiment with the advance until you find the best power spot on your engine. You will find that your idle speed increases when the timing is moved up, so be prepared to back it down to keep the drag off the drive belt. The idle adjustment is on top of the pump. Again, keep an eye on the pyrometer so you do not burn down the engine as you find the sweet power range.
The pyrometer will be available from most diesel specialty shops, diesel truck shops, or on-line from many of the guys that specialize in running the power up on diesel cars and pickups. Or, directly from Isspro.com
There is another side benefit from increasing the power and timing, the fuel economy will increase by nearly 30%.
These engines will also handle a turbo, but that requires a bit more pump work and enriching the fueling circuit. Again, any diesel injection shop can turn the pump up for you, or if you are familiar with the Bosch VE series pumps like used on the older VW's and Dodge Cummins diesels, you can follow the same protocol as for those pumps to crank up the fueling rate enough to handle a turbo. I current get a bit more than 72 horses out of mine and am watching my drive system to see how much it will really handle before turning it up any more. If you do a turbo, you have to remember to do a cool down sequence every time you shut it down just like a truck or tractor.