My brother has located another COE for his never ending collection, he does not have it in hand yet. He went over to the location ( 20 mins. away) and got a number off it, F-33HD. Is this a 5 ton Jimmy? It has 10 lugs on the wheels. What engine is in this beast, 426, 503? He is going nuts waiting to have it on the property.......3B?....Spanky?...