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Because we left our old oil pump in the 289, we needed a new pump drive rod. If the collar is not positioned correctly, the drive rod could come out of place if the distributor is pulled out. The rod will then drop down into the oil pan, and you’ll be looking at an oil pan R&R before you can replace the distributor and run the engine. Position the collar so that it’s just beneath the lifter valley floor--not touching, but close enough to prevent the oil pump shaft from disengaging the pump when the distributor is removed.