[Dragsinger]

Adger, I "think" all GM manual boxes will be about the same in ratio. [maybe an exception but it would be a rare option] The greater turn to turn ratio of manual boxes is an advantage, steering is not touchy]

The 60's and 70's three-bolt top gear is a good choice but it takes careful searching to find the correct spline count. They are out there, I have found and installed several.

An S-10 box is available reman from most parts stores. To my knowledge, there is only one part number. It's advantage, a direct bolt in replacement, remove power gear, install S-10 manual gear.

The quicker ratios come with PS boxes.