8k rpm ...

Most true! ^^^^^^^

Stroke the 340 and make peak power a lot lower in the RPM range. This equals longevity as it is not taxing the engine through RPM’s out the WaZoo!

A powerful stroker needs good heads (carb & intake) to feed it. I’d rather make 550 hp at 6 or 6.5 than 8K RPM any day of the week.