Ok so on the front of the block for sure MH 340 R 3911862 was really hard to read so i sanded off the paint and used a sharpie to get some definition the bottom of the r is faint but it is there and so is the 9 instead of the 8 so that seems to make more sense.

2013 Chrysler 300 touring 1974 Dodge Charger SE. 360-727-8.75-3.23 sure grip 1972 Dodge Dart Swinger 1995 Dodge Ram 1500 4x4