413 truck engines ran that RPM range day in and day out on mass production tolerances and that was under constant load. That's the DNA of your 440, a dump truck engine lol. They ran ten lifetimes of going to the Dairy Queen by comparison.

Basically build it for endurance. A boat engine is a good description. Good quality internals, lighter than stock would be good but not NASCAR light. Lots of oil capacity and cooling capacity.

You spin it faster, it wears out faster. Synthetic oil and a good filter will mitigate that some.

Don't get crazy with the camshaft. Big springs and aggressive lobes beat the crap out of the valvetrain. Not such a big deal on an engine that idles and then runs WFO for a few seconds and then idles again. Another thing entirely running 2 hours at half of WFO.

Built like this it will live as long as you can afford to pail fuel into it.

Kevin