I have been looking for a date correct 1971 block for my SPD April 30th 1971 Cuda. My buddy from Pennsylvania sent me pictures today of a 1971 block that he has... the casting number was definitely in the ball park for a Mounds Rd engine including hints of the Corporate Blue paint but when I asked him for the numbers under the numbers below the #1 cylinder, this is what he sent me. Can anyone here help me decode the Two lines, it looks like the first line has light stamped 3,6,8's or 0 and then a 2 on the first line and the second line reads MH 340 R (Regular Fuel) or P (premium Fuel)I believe, MH could be M=Mounds Rd and the H would be 1972 assembly but usually the year proceeds the plant from my experience, like GM for 71 Mounds Rd or FW for 1970 Windsor. The last Picture is the current May 1st 1970 engine I currently have for the car which looks nothing like his block numbers.