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not sure what the white plug is but i pressume its either power for injecotrs or coils
maybe air con i know the vy and vz has a white plug that powers ecu and coils and injectors

i havnt done a 6lt yet

cant be to hard

do u have a guy to do the wiring for rest of the engine

its not hard job just time consuming getting done right you have to trace where all the wires go

alot of conversions these days is a full day or 2 worth of wiring just to get engine and the rest working correctly