Your analysis is spot-on. Most gas-engine Chryslers use one of two engine controller architectures (GPEC II or NGC IV/IV-A), and the Viper controller isn't one of them. It's unique to the Viper V-10, and uses standard Chrysler diagnostic/bootloader security, which means that it isn't "unlocked"...
As a Challenger owner (2012 SRT-8) and a Gen V Viper owner (2014 GTS), I don't think it's practical or desirable to put any "Hemi" in my Viper: it is, as someone else has noted, much heavier than the current V-10.
As a Viper driver, and "retired" autocrosser/club racer, I can't fathom what the...
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