I'm not sure about the location of the casting numbers. The service manual has a picture of each motor. The 292 CI has an oil filter that mounts vertically, the 230 oil filter mounts at an angle. Hope that helps. DValentine
There is a pad on the right side of the block behind the distributor that will have a series of #'s and letters stamped on it. If you reply with what you find, I (and others here) will decode it for you. Good luck. Jarhead