1993 Ford f150 lightning?

I have the 40th one ever built. For some reason my engine is a 302 and I did my research on it everything is original. And I know it is a 302 for a fact by messing up one of my valves by doing a tune up on it myself using 351w parts. My question is, is this something very rare to have this engine matched with this truck.

SVT built the Lightning with a high-output V-8 based on the 5.8-liter, 351-cu.in. Engine. To ensure you are buying a Lightning and not just an F-150 with Lightning accoutrements, look for the "R" code in the VIN. The engine had 8.8:1 compression, a 4-inch bore and 3.50-inch stroke. The stock hydraulic, flat-tappet camshaft specifications are: duration at 0.50; intake 200 degrees and exhaust 214 degrees; advertised duration is 260 degrees intake and 274 degrees exhaust.

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