Rare Dodge Dart GT? Which engine is this?

In terms of the fender tag, it’s been very challenging trying to decipher what’s on it due to dirt and paint that had to be scraped off. I can make out a few digits but nothing comprehensive. Is there anything I can apply to it to clean it up?

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You can unscrew the fender tag and take a photo of the backside. The print will be backwards but I can invert it for you.