Im about to pull my old motor/tranny out of my 89 fsc and put it up for sale so I can drop in an ls1. Id like to do the wiring myself rather than spending $500 on a new custom harness. My question is : Do I need to keep the stock engine compartment harness for the swap or should I leave it on the motor when I sell it? Im just trying to get the most money for the motor/tranny as a complete setup with computer etc. Maybe I should keep the firewall half of it and sell the engine half with it?

Also is $1500 too much to ask for a rebuilt 350 tbi with a 700r tranny?

thanks