1970 340 has the 1973 low compression pistons

Last time i checked 1 point of compression on a STOCK engine was 10 hp . Ive seen it in action. 10 horsepower equates to 1/10 second, these are not hard fast rules but approximations.. Look it up for yourself.
I'm not debating that. But TO debate that, you don't know squat without a dyno.

My point IS the 340 was never "10.5" compression. It was RATED at 10.2. Rated. The actual MEASURED compression was "somewhere" around 9.5 because of Chrysler's tall decks and larger than advertised chambers. This is common knowledge across Mopsr circles from people who've actually DONE THE MEASUREMENTS and not just sat back being an armchair blowhard. You'd know that if you'd been paying attention to the right things instead of spouting nonsense.