Get the hemi crate motor, or go to a aftermarket vendor for a motor. If you buy a crate motor from ma mopar, disassemble it and check it out completely. Some known weak points are rocker studs (replace with ARP fastners), inproper oil ring gap alignment, poor pre-assembly prep (cleaning) and leaky rear main seals. If you buy the Mopar crate motor, it's a good investment to go over it.
As far as comparing a hemi to a 440....both can make good HP, but nothing like a hemi for underhood "impact".
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