That may be true but that isn't a factory parts book and may not reflect actual production.
There are an endless availability of aftermarket springs, Mopar Performance or other.
Show me Chrysler literature from 64-67 showing this information.
I really don't care to prove anything to anybody. I've had 4 or 5 of these engines and cars since 1970. The springs on 4 barrel 273's are painted a different color and have different loads. Not everything is in the parts books either. I personally always run 340 red springs on all my small blocks.
