I didn't think you were full of BS customx. You could be right and have a rare engine.
I guess Ford might have made a smaller police car option based on the Fairlane instead of the full size car for small town police departments with a smaller budget.
The code says 72 Fairlane/Torino interceptor heads but it doesn't say 302. The 351 was used in a lot of 72 Fairlanes though and I would think that would be more likely a choice for a police package. Check the stroke. The 351w looks a lot like the 302.
The compression ratios I gave were for for a stock engine. With special heads your's is probably higher.