I see in your pic you have a wiring harness drapped over the 5.7 Hemi but you quote in your future expenses that a MOPAR harness is $4500. If you cant use this one on the engine cant you just get another junkyard harness and ECM? I would really hate to see you spend that kind of money on a harness when there maybe a few other options.
Great buiild though, I was toying around with a 5.7 Hemi daily driver as my next project. In a A-body of course!!