1971 340's True HP?

69 Cuda 440 said

Mopar 'toyed' with idea of developing an 'LA' 318 4-Barrel 'Commando' in 1968 for the Plymouth Valiant {only}.

Kind of an Economy-Stocker that was thought out in November 1967.

It was short-lived though.

The 318/240 HP 4-Barrel was relegated to 'Marine Duty', but did find it's way into
a few Municipal Vehicles on special order only.

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There were a few of those "intermediate performance" packages ,shelved by Detroit in the '60's. For Mopar,the "D Dart " option ,and the one you mentioned ,would have rocked. Pontiac had the 350 short block with a Ram Air 4 cam, big valve (16 castings, IIRC?) and cold air induction ,on the plate. That was a low buck effort ,model name was "E.T." as I recall.Olds 350 "W31 " option was nasty,as well. My machinist (62 years of age now) took a 4 speed version for a drive,scared the sh*t out of the salesman.. He ended up, buying a year old '67 Cuda 273.