You can make them work but it is probably a bad choice. Best bet is anything that is 1973 or newer since the uni-cast rotors are easy to find and tend to be pretty cheap.
I am not trying to hi-jack the post or anything but when did Mopar go to the 1 piece rotors. The reason I ask is that I have a brand new set of rotors for my 72 RR that are marked 70-72 and are correct for my car but they are 1 piece rotors not 2 piece.