John, I believe I would run a compression check on those two cyls . Just to remove any doughts. As to the oil line restriction, if it is the same as later models, and I believe it is, the "restriction" is in the fitting that the oil line from the filter, if so equipped, connects to at the front bottom corner of the head. Even if no filter the oil pipe to the rocker arms still connects same place. You can see it in this photo. Ben