No disrespect,,,,but the LS engine is a whole different animal .
That’s apples and oranges to a small block Mopar .
Those cathedral ports are nothing like a Mopar head,,,,,and are not a fair comparison .
I do believe that the start of a happy result for the 340 would be to go higher with the compression .
And I mean a true real compression,,,not a calculation of what it theoretically is .
A few CCs here and there can easily lower the real value a quarter point or more .
When people think they are running 10.5,,,they really only have about 10 to 1 .
Back in 69 when Chevy put out the 302,,,,that was a bad little dude .
And those pistons were ever so slightly short of 11 to 1 .
Heavy TRW pistons they were,,,,,but it was an evil little engine,,,in the right hands .
If Mopar had done that to the 340 in a beautiful little Dart,,,,,man,,,,you talk about some embarrassing times for Chevy and Ford .
A 68 or 69 Dart,,,with a 340 with 11 to 1,,,,solid cam with high .480-.490 lift.,,,,X heads,,,,good aluminum intake.
Then,, in front of an A833 4 speed and an 8 3/4 with 3.91 suregrip,,,,and super stock springs .
Oh yeah,,,,,,wild times for sure !
And that car would have sold,,,,,it would have been a contender for the win every time .
Ohh wellll .
That never happened,,,but I believe it is still possible to replicate .
Tommy