What ECM are you running?
I've understood it that you have to go backwards to run cable throttle body on LS3. Which means getting a 24 tooth reluctor for the cam and running the LS1/6 style computer.
Not to burst your bubble. I actually prefer drive by wire because of the ease of setting up cruise control. Two buttons and bam, cruise. Not like cable. You have to install another module and another cable at minimum.
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