Interesting vintage test video (non-Mopar)

It would burn a 383 to the ground. Chevy also rated it at 375 hp. The same engine as the 425 hp L 78 Corvette. Sneaky Chevrolet.

I learned some things today... Chevrolet Lied! Stone-Stock 1969 L78 396 Big-Block Makes 50 HP More Than Factory Rating - Hot Rod Network

Definitely need at least a 440 to pull one of those things down.