yeah, its the last three numbers of the part number on the PCM. Your PCM is going to need tuned no matter what, at least to turn off the VATS, rear 02s and various smog option such as the fuel vapor solenoid, plus tuning for tire sizes, gears and anything else that is different than stock. I'm not sure but there shouldn't be any reason it can't run the old 60e. I don't think it will last long though.