I had a 70 D200 many moons ago. It was a factory 383 truck, and I remember it having a front sump oil pan. There was a mile of room between the pan and axle, so I don't know if it would be an absolute necessity or not? Gerst Suspension had a nice conversion setup for those trucks at The Nats this year. If you're looking to lower it and have a modern PS rack.....it might be worth a look.