I have a 1973 Dodge with original 360 V-8 engine. The car starts and drives okay. However the base of the distributor does not seat against the top of the block. There is about 1/8 inch of clearance between the top of the block & bottom of the distributor base. Further the distributor is very hard to turn when I set timing. Thus far I have tried removing the distributor and tapping down on the oil pump driveshaft to see if it is not fully seated on the bushing. I also cleaned out the slot at the top of the oil pump driveshaft. I’ve removed the oil pan, 1st and foremost to clean out debris in the oil pump pickup, but also to see if pulling down on the oil pump driveshaft would help lower the slot for the distributor shaft. The oil pump driveshaft is fully seated against the bushing and pulling on the bottom of it does nothing. I cleaned the base of the distributor on a wire wheel and installed a new O-ring. I lubricated the O ring with light oil, but still the distributor base will not seat against the top of the block. Yet, when driving the car, I would never know that this problem existed. The distributor does not make noise. Is distributor driveshaft set up wrong in the housing? How would I fix this issue? Wrong oil pump driveshaft bushing? Has anyone run into this problem and what did you do to fix it? Thanks for your help as always!