I meant the 383 in the 1965 Chrysler 300. I understand there was a later 383 that was a different design, but I had no experience with it.
Okay gotcha. The B block 383 didn’t change too, too much in its 1959-71 run. There was however an odd RB block 383 for two years (tall deck block with a longer 3.75” stroke crank like the 413-426-440) but that was just a stop gap 1959-60 until the B block production was ramped up.
The 1965 300 and 300L were really nice cars!