The 6-71 is probably one of the most reliable Detroit Diesels, sort of a staple engine that has been around forever. There's a bus site that talks about the care and driving of a 2 stroke Detroit, and the first rule is is that you drive the thing like you stole it. Don't lug this engine, put her to the floor and rev her out. All Detroits have a Roots blower that scavenges the cylinders (it won't run without it) and turbos have been added for extra power. Do not use a multi viscosity oil in these things, only straight 30W or 40W, elsewise you are going to scuff the liners. If Delo 100 is available, that's what you use. There are a couple of members that work on these things for a living and can probably tell you more than I can. But aside of being noisy, they're good engines.
You don't need to premix the fuel or anything like that (you're thinking gasser).
If you need to get more power out of it, you can easily add larger injectors and turn the rpm up on them.
Your engine is rated at 238hp and 650 ft/lbs of torque. Max on road rating is 290hp and 810 ft/lbs with a turbo and aftercooler (factory rating)
Before you drive it, the cardinal rule is to smash your hand in the door and take it out on the motor. Don't ever be nice to it except for maintenance.