Are you looking for this 340 motor?

HemiSSDart said

There were no 340 cars built in Newark, should be a "B" I believe and built in Hamtramck or "E" built in Los Angeles. Red engine was an early built Dart or Barracuda because 9-17-68 was the TSB for Turquoise paint for the rest of the model year, so rare engine to see for sure!

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Thanks for the info.If that can't be the letter F It almost has to be an E by the looks of it.I have had this motor for years going to try and sell local for a $1000 STD block crank and pistons.I also have Xheads intake,exhaust manifolds timing cover oil pan carb for sell also.Thanks again for your info..