[JSeery]

LOL, like your reply. Wish we could get some other inputs here, it is always good to have multiple inputs! If it were me, I would be interested in the history of the engine, who rebuilt it and what parts were used. As far as running it I'm not sure what you can test other than it starts, runs, doesn't vibrate, oil pressure, etc. Could put a vacuum gauge on it. I would start the engine and run it through various RPM ranges and see how smooth it runs, are there any strange noises. That should not take more than a minute or two. Beyond that not sure what you could test running it. Look it over for water leaks, etc. that's about it. If you are really concerned about the health of the engine you would want to do a compression test on all of the cylinders. I'm not sure you could really test it for overheat issues on a test stand, there are a lot of variables to the overheat issue.