Should I go Big block or Small block?

Hey everyone. I've decided to build a new motor for my duster. This will be my first complete engine overhaul. I'm a mechanic by trade, just haven't done a complete overhaul yet. I have lots of motors in my garage to chose from as a starting point. I've got 318's, 340's, 360's, and 440's. What should I build any why? I want some opinions. Thanks!

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