A DIRECT SWAP '71 904 for '70 904 plus... ???

Thanks OLDVART, I understand your info but I am also taking the driveshaft from the 8 3/4" rear & can use whatever spring parts I need from the 8 3/4" car, SO the driveshaft from the 8 3/4" car will already be shorter & won't need to be shortened as it is already, RIGHT? THANKS AGAIN for sharing your experience with me. Paul