Bern, since we first met, you have been telling everyone all how every engine in the world will just self destruct if it is turned up the slightest bit, in spite of factory ratings far higher using the same parts.  Somebody has to make a reasonable response to that :).    In this particular instance, Rick and I are both speaking from personal experience when we state that the 8.3 in the Magnum will run just fine north of 225 hp.