I agree and have known people who wouldn't even bother with a small block LA it was 383 minimum but they were also running B bodies LOL! The one guy did stick a 383 in a 69 Dart and drag raced it. Looking at the 70s 318, 36 were low comp smog motors,the 340 was a factory performance small block built to rev. 340 is special in a collectable sense. very good in an A body barracuda, Duster, Dart, Demon etc.
I had a 63 Dart Gt, I was going to shove a 392 first gen Hemi in with 12 and a half to one Jhans Pistons... somebody stole the motor out of my garage good thing is they only got seven freaking Pistons cuz one of them was in my bedroom!