are you dead set on a posi, or are you open to other differentials? there is a locker differential made by powertrax, its relatively cheap as far as diff's go and it can be installed in your garage in just a couple of hours with no special tools. here is the link:
http://powertrax.com/locker.htm
you can get it on summitracing.com for about $300 just a suggestion
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67 Coupe 289, 2 1/4'' pipes w/ Flowmasters
Edelbrock 600 cfm 4bbl carb, Edelbrock Airgap intake
Hooker headers, MSD Ignition system
Next: new tranny, T5 or Toploader
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