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Yes it will and the early WS6 boxes are one of the best.
Here's a chart. You can see the box is a constant ratio at
12.7-1.
http://www.chevelles.com/techref/shea_3.html

From Olds facts..
The fastest ratio factory steering-gear had a constant-ratio 12.7:1 box, which should result in just over three turns lock-to-lock in an A-body. In the WS6 Trans AM's of 78 to 81, they used a 12.7:1 ratio, and constant ratio, where the regular T/A and Formula FireBird got variable ratio and 14.1 (or so):1.
 

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Well if you're lucky the decal will still be on the end cap of the
box. Sometimes it's a decal, sometimes it's just stamped on.
I'll have to do some research to find out about the part numbers.
 
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