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I've heard Patrick's has decent prices on parts if you go that route.
With that low a mileage you might be able to restore some life to it by liberal use of Marvel Mystery oil. It does a good job of softening hard carbon. We used to run it in the fuel and the oil of the little Contenintal engines that were commonly used in small aircraft back in the day. If you didn't use it , it was about guaranteed you would stick a valve. It will also decarbon the piston rings pretty well and may help your compression.
Those old Merc-O-Matics start in 2nd gear when you drop it in D. It takes a bit of torque to get those heavy old cars going. If adjusted properly, they work fairly smooth though.