I have recently purchased an '87 Dodge D150 w/360. I know the truck originally came with a slant six and the 360 is an aftermarket swap. But i am trying to find out more about the 360 that is currently in it now. The casting numbers for the block are (36010R1260). Can anyone help me to decode this casting number as to i have not been able to locate any information pertainin to this number anywhere.