If "what Chrysler did in 1970 means nothing", then no one should ever call a 340 a performance engine because it only made 275 hp. A lowly base model v6 makes more than that now. AFAIK, the factory hi stalls were all 10.75 units. None were 11.75. Sure, the stall on a factory HS converter may have not been very high. Even so, I would imagine the 340 cars would have been rather doggy on the bottom without it.