Poly Engine what was good/bad about it and why is the LA better?

There are a few foibles in the novel, Dennis (narrator of the story) said "Like the 382's they used to put in those old cars. Like Christine.", & "He dropped the hydramatic into D". Also indicated 1 4bbl when They discovered the car, later "318 painted on the air cleaner" post "resto"...given that, I have an appreciation for Carpenter's crew, doing the movie Christine w/the top of the line '58 engine combo accurately.
I remember that. I went looking for the book, but it wasn't in the most likely spots, so after a half hour I gave up. The 382 I just figured was a typo. My daily driver at the time was a 383 RR. I looked up the 318 in a Chilton's book, and saw they had 2-4 bbls in the '58 Fury. So, King used some artist's license, and Carpenter did too. At least King didn't flip out over the changed ending, like he did over Kubrick's The Shining. Regardless, it's one of the best horror movies ever.