As it turns out when you take a Jeep with over 400,000 miles on it, some things which were fine give it up with the addition of almost 50hp and about 75lb-ft of power. We noticed the Jeep heating up more than before, but by putting our swapped-in electric fan on "high" we are able to keep it under control. We couldn't control the slipping of the oil-soaked parts-store clutch so we swapped in a Centerforce Dual Friction clutch to fix the problem. The actual problem was leakage at the back of the valve cover dripping down the back of the engine. We fixed that long ago, but our clutch was still toasted. With the Centerforce, we should be good to go for a long time to come.