I will agree with the 1977 FSM, listing for both 413 and 361. This battle is getting bloody, I do have a 1979 440 block in my race car, yes a 79 block. Ok, I drank a lot of beer today, close to a 18 pack spead between Hams, and Grainbelt. I seen something I though was interesting today, no it wasn't a UFO but very close. I had a guy stop buy the shop today driving a 1997 ram 2500. That was biult with 6 bolt wheels and even had a non-magum 360 factory installed in it. No air bags, a fancy little bottle jack that a Chrysler sticker on it. Everything under the hood was in spanish, some sort of mexican inported truck.