The distributor will usually not drop fully into position until the engine is cranked to rotate the distributor shaft into alignment with the oil pump extension slot. I usually install the distributor hold down and run the bolt down until it makes contact and then crank the engine and immediately shut it off, continue running the bolt down until it is snug and then timing it with a light. But I gotta say, Busted Knuckles instructions are more understandable than most manuals.