Mateo1606

Hey I am going to be doing an LS1 swap soon and b4 i buy the custom wireing harnes i was wondering if i could use the stock one fomr the motor and just just off the connctors i need and lably it all of course lol and then put extensions were needed with cripms then heat shrink and then put in a new loom would that work or will that compermise the electricl system? Also i am going for a really clean and tidy looking engin bay so i would like to route the wireing how i see fit to make it clean looking will that work if redo the wireing that way i discribed? thank you!