I upgraded my '72 Lemans Sport convertible with a replacement steering gear for a '86 IROC Z28 from O'Reillys for $140.00. It's a factory replacement 16:1 ratio. Same physical case as your '70 GTO, bolts right in. I did it in 2006. Not had a problem with ever since. It's 3.5 turns lock-to-lock.
If you are looking for the lower ratio / quicker 1-/12.7:1 ratio, you will pay a lot more money for it. Unless I'm doing autocross or road work, I personally don't need that quick a steering, but it is definitely a big improvement over stock for a whole lot less money. That's my 2 cents.
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