I've run my LT1/4L60E with the gearbox wiring disconnected when I moved it on and off a trailer, it runs fine. I would think to do it properly you would just need to flash the PCM with software from a manual, and chop out the un-needed wiring. The only issue I can think of is the VSS signal which is used for controlling some parameters on the engine (eg fans), but plenty of people run without it. Dont know how hard/easy it would be to swap one suitable for an LT1 in if you wanted it perfect.
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