Convert slant over to v8

i am doing the same thing, already have my 318 rebuilt, i am putting a v8 k member in mine though. I think im giong to buy a new wiring harness for mine, ive heard that Painless wiring systems is the way to go, but they dont make them for 75 dusters, but they do make them for darts i believe. So do you think if i order a harness for a dart, it will hook up with my duster?