My brother is in the middle of a 5.7 Hemi / Viper 6 speed transmission swap in his Warlock. He has been busting his *** to get it done for Mopars in the Park at the end of the month. Between fabrications and ecu / wiring harness issues he texted me the other night, and I quote:
"Bailing on this Hemi bullshit. I shouldn't have bought this motor. Intake won't fit under the hood, the intake I wanted to swap on won't fit. The guys who make the harnesses don't have truck motors to work off. so a custom harness is all on me if they make it and it doesn't fit. So close. So much money wasted. **** this ****. Selling it all if I can and searching craigslist for a Yugo."
I hope that helps you make your decision!