The Stallion was an appearance package. It is not listed separately in my price guide so I don't suppose it actually adds any value to the car. The 76 Mavericks have not become as valuable as the earlier Mavs but in time it may get there.
If you want to know what it is worth let me know and I will look it up for you.

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Paul
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retired mechanic after 35 years
specialized in Holley carbs and Ford Automatic Transmissions