looking for head identification

Hey guys, can any one tell me where I can find the head identification numbers for the heads that are on my 360. I just pulled it out of an 86 w250 4x4. the block has 4179930-360-2 on it. I pulled the valve covers off, the only numbers I could see was 274. I did see the numbers 00599 9293 1 242 stamped just below the left head. I really do not want to take the head off. thanks any info will help.