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Don't mean to be persnickity, but...
The 240hp was gross rating, reflecting the poorer cylinder heads and compression ratio, compared to the 275hp version.
I don't think a 340 was ever rated net by Mopar, but if it were, it would probably have been in the 180-195 range for the 8 to 1 motor.
(and almost everybody knows the 275hp version is very softly rated. Most, including nhra, say it should be 315-325hp)