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Lew,
I have a Toploader in my '66 Mustang. In order for it to be quicker around city streets, I chose a 3.50 rear gear ratio. The fourth gear in the Toploader is 1:1, therefore the final drive ratio is 3.50:1. On the highway, the car can seem a little "busy" with the higher rpms required.
The advantage of the TKO-600 or other 5-speeds is the overdrive gear. It allows you to reduce rpms on the highway, while maintaining performance at the lower speeds.
My two cents.
Tim
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