Where is the EAD on a 340? If it's below the head on the drivers side, how do you read it? My 69 is marked EW340P25880427. The SPD is Dec 9. The block has a cast date of 8-16-68. The exhaust manifolds are 11 27 8 on the right and 11 14 8 on driver's side. The intake is 10 29 8