340/418 Stroker questions

That's good to hear. I wouldn;t compare Chevies capabilities to Mopars. The designs are not apples to apples even if the lobes themselves are interchangeable. Pushrod angle & lifter weight would be advantages in a Chevy. It's probably the beehives that allow your rpm and for me it's usually a financial decision to avoid them. Std dual springs will give up earlier than that but I typically don't go that much higher than peak and like you say - it's peaking at 55-5800 so the dual springs are fine and don't require retainers and locks to use them. If those rpms were a "must have" for the customer then spending would be no problem but these guys aren't winding them that tight.