1974 dart 4dr Questions

so im picking up a 74 dart 4dr

its got disc breaks and i dont know if its 5on4 or 5on4.5. the guy doesnt know is there anyway i would know i dont want to drive all the way there to find out... its a parts car. im pulling the rearend out wand disc breaks out and power steering out. so if you need anything just message me.