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You'll probably have to reduce fuel in a major way. I don't recall if you can change the # of cylinders (or if you should even do that or not) on the 7747 ECM.
There is a scalar labeled cylinder select and it's set for 6. Found a bin somebody posted a few years ago. I'm going to give that a try and see how it runs.
82 J10
77 J10 Golden Eagle 401
88 GW
You know it's bad when your car is on the EPA's 10 most wanted list!