Most definitely no one here would turn down that setup if opportunity and price was ideal. You may be only one in the country with that setup in a classic truck?
I turned down a 6.4 long block (non super charged.) setup for my B-body at very responsible price. But brain took over saying "You want to pull a very nice running 440 at 400+ HP to spend 20k total (after K-framing, fuel, exhaust, electrical upgrades) to retro a 6.4 to gain 120 HP?
But this new Demon beast is entirely a different animal. Sorry 440. I think it may be a must.