wiring harness???

So a year or so ago my fusible link burnt out and melted my wiring harness on my firewall (engine side) trying to find new or used wiring to plug in and do myself was told they dont do the painless kits for the slant 6 or are thry just generic cause i dont wannaa drop 600 on a kit for it not to work or if someone has one laying around thatd be great as well