i just took a 454 out of the back of a pickup on the way the the crusher and i'd like to find out what year it is. it's susposed to be out of a 72 3/4 ton duallywith 80,000 miles on it. the heads are very clean like someone changed the oil alot i'd like to find out what it's worth and try to trade it for a mig welder. so were can i find out what the #'s mean? any help would be greatly app. thanks. Dennis