The rear gears for all 79 400/4spd cars were 3:23's. I've never had to look for a set so not sure how hard they are to find.
As for your VIN, is it low or high for 10th production?
I had a 400 10th a few years ago that was built on Jan 3rd, lowest VIN for a 10th I have ever seen......140323.
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