3.4 to 5.3
A V6 to V8 conversion might share a lot of the same wiring but there will be lots of cuts and splices.
I think it would be easier if you found a wrecked LS1 car and could get the complete wiring out of it to transfer to your car.
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Unless you are completely sold on the fourth Gen revision 1 V6 skin, I would buy an LS car and be done. I'm sure a complete car would probably be cheaper after selling your V6.
Option 2 would be buy a wrecked V8 car and swap everything to yours if you have the room.
also after some research at the local autozone I have found that the v6 and v8 cars racks our the same housing for the most part, they list 2 options for suspension for both v6 and v8 with the same part number for both v6 and v8 cars, but must be a 98 or new rack because the lt1 cars are at a different angle



