"440 cubes, 500 horses"

The engine that they showed...

https://i.imgur.com/OQE3ZNn.jpg

... was not a 440, it was a small-block, probably a 318. The easiest way to tell the difference at a glance is: a Mopar big-block has the distributor up front near the alternator, while a Mopar small-block has it in back.

Technically it's possible to bore and stroke a Mopar small-block to 440 c.i.d. (or even higher) if you start with a 360 block or aftermarket block, but that would require an explanation, because by default, "440" refers to a Mopar big-block, because that's a factory size, just like if someone says they have a "454" in their Chevrolet, no one would take it to mean a small-block that was bored and stroked to 454 c.i.d., even though that's technically possible as well.

Since it was almost certainly a 318; with the relatively easy and cheap upgrades that people typically do (e.g., port and polish the heads, 4-barrel carburetor and intake manifold, headers, dual exhaust, performance camshaft), it would have made perhaps 275 gross horsepower at best, which isn't all that impressive in a ~4,000-pound car.