my v-10 will roast the 285 75 16 tires and i roast most stock diesels on the road including duramax,cummings ford 6.0.now the turned up diesels will probably smoke my truck.as for building a 440 for towing i have 2 440 trucks they have same power but there is no way i could haul 10000 pounds of load with those without running premium fuel .v-10 87