According to my machine shop, stock block center to center from the Crank bore to Cam bore is 4.335. On my block it’s 4.418. There is +.083 difference. This is an early On Center Stage II motor that was initially built by Ruggles. I was told by a very reliable source that Mr. Ruggles himself told him that he had moved the cam bore up slightly in few motors when the cam bore was machined initially for clearances purpose. Initially, this motor was setup with a Gear drive setup and ran about 4500 miles with the previous owner. Since then, he pulled out the motor and refreshed it and went to a smaller hydraulic roller cam. Well I bought the whole setup as a project and I want to go with a chain instead of the gear drive that’s on it already, especially with all the gear drive issues people are talking about. This is a street car with a 224/224 276cui hydraulic roller cam setup. Has anyone ever run into this problem? I am sure there might be other motors out there with similar issues. Any help greatly appreciated. This project has been dragging due to a new born that putting everything on hold but now I want to get her done!