Don---Put a radiator on it. You can't get a new engine hot enough to "run it in" with the old garden hose trick. I built a beautifull engine test stand when I built my 27 T roadster about 10 years ago---only problem was it took up so darn much room after I had the roadster finished that I cut it up and re-used it for other things, just to give me room in the garage.