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I bet it wouldn't be hard to add the power top feature. I've seen all the replacement parts at the Mustang dotcoms. It sure was nice to pop the top at a stoplight on my 71 Challenger!
Since I aways use the boot cover, it wouldn't be any faster to drop the top on my car. I've had the car 15 years this way and see no need to add a hydraulic system etc... to it. I think the manual top is somewhat rare anyway. I don't see it very often.