Yes it would since it is "only" about 3.5 turns from full stop to full stop compared with the manual at almost 5. When you add the power unit to the manual steering box you don't need much effort to turn the wheel. Now, with that said, Ford did offer a Dealer installed power steering unit for the Mustang. I have never figured out what was in the kit. Most importantly was the power steering box included or not? The answer to that question might help determine what Ford engineering thought was acceptable. Another point is that you want a good, no slop steering and suspension system, whether it is manual, power, or a manual to power conversion. The correct power steering box, if it is worn too much, won't give you acceptable results. Lastly, with the skinny biased-ply tires with a small contact patch, on the 1960's cars, the manual steering probably was not as bad as it is today with wider radial tires. Also, customer expectations were a lot different in the 60's, so the manual steering was probably acceptable for most people. That's not the case today. Good luck no matter which way you decide to go.