I am in the process of doing the 6.1 in an Abody. Not running yet. Street and Performance (as well as others Im sure) can reprogram a factory computer. Or you can go with a FAST or AEM system. Dave Weber at Modern Muscle can get an AEM system real close before he ships it to ya. Then taking it to a tuner would be the next step.

FYI, using the AlterKtion or similar front suspension makes the 6.1 swap much easier than a factory Kframe.