I talking about simplicity of the setup. I've made MM's out of 2inch box tubing, but (probably like you) I have a chapsaw, plasma cutter, 4 different welders, mill and a lathe, so nothing is out of reach, but over time I'd rather not use any of those tools mentioned to just put an engine in a vehicle.
Im not knocking the Caddy engines, I ran a 472 years ago in a '31 Dodge PU, just for the coolness factor.
Also, stock vs stock isn't a good comparison, I'll put my "stock" LS5 454 in my '57 up against ANY stock 500 Caddy in a truck