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You left out some important information for a best recommendation. Namely, primary use. Is this a cruiser, open track car, drag car, etc. What size tires will you be using?
I said 3.23 for a variety of reasons. With mountains of torque and power in a light vehicle there is no need for additional torque multiplication. With a four speed and one to one fourth gear you will probably find 3.73 a bit much for freeway cruising (3600 RPM with 275/60/15 at 80, 3100 at 70). That with a motor that will generally not rev as high as a small block, etc, etc.
On top of that, after years of reading this very same question, those with similar setups seem to prefer the 3.23.
Hope that helps!
Rick
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