I cant give you any comments really because I haven't run the car enough before doing a mini mechanical restoration, but the 74 SD I picked up late summer has the 51-314-4 in it. Test driving the car before I purchased it seemed as if it was short on bottom end power, and light on vacuum for the brakes. I will be finishing a tune up here soon and will be able to give some vacuum readings and such, but with winter here wont be able to drive it for some time.
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