Thanks for posting! Congrats Joel!
Hey, I don't doubt his is a very rare car. But, I lived near Grand Spaulding Dodge on the north side of Chicago then. They were about the #1 Mopar muscle car supplier of the era. But one of the salesman told me, a mere 16 year old then in 1967, that very few Hemis were sold. Later, like '68 until IIRC 1973, the sheer # of 383's by far outweighed the Hemi sales. Same for the 440's. Both were a far cheaper engine by far as the Hemi cost approx. 20% more of the car's 383 equipped list price!
Per a M/T test
"When Dodge unveiled the freshly restyled Charger in 1968, it was a natural move to offer a fortified R/T musclecar variant. Though its standard 375-horse 440 Magnum was potent enough to handle nearly anything in the other lane, there was even more. Enter the optional 426 Street Hemi. Not available on non-R/T Chargers (though at least one non-R/T badged Hemi-powered engineering mule was shown to the press), the 426 Hemi added $604.75 to the Charger R/T’s $3506 base sticker price. Think about that: The Street Hemi added nearly 20 percent to the bottom line. It’s no wonder only 475 Charger R/T buyers went for the extra expense of the Hemi in 1968–211 with Chrysler‘s four-speed stick, and 264 with the bulletproof Torqueflite automatic."