Getting ready to install my heads and I am not sure which goes on what side of the block . Looking at them I can't tell the difference other than one has 9 cast on it and the other has a 15. Both obviously have the 8445. It may sound like a dumb question but I don't want to make dumb mistake after going through all this work. I am also trying to find which location to install the longer head bolts that came with the ARP head bolt kit. I forgot to write it down when i took it apart.