Sorry I can't tell anything about the exhaust on your photos (off 90 degrees) and hard to look at. I can only see one exhaust pipe outlet but too hard for me to tell.
The "848" head is slightly higher compression and therefore is thought to be desirable. Valve sizes are the same as a std 235 head however so it's something I don't understand unless that heads has lumps. You may have a pretty good engine there. Someone will know for sure.
