Just measured a 292 equiped with air conditioning and power steering. The length from the rear of the block to the front of the vibration damper is 32 1/2" + - 1/8". Haven't picked up the engine yet, so I haven't checked the casting date. The engine has the early style HEI and a separate intake manifold, so I assume that it is probably a 1974, as I think the HEI was an option that year. I'm going to put this in a '56 3100, so If anybody has done this swap, please let me know. I will be using Langdon's engine mounts with a Chassis Eng. crossmember.