Helping a buddy w/ 383 71 Dart, MM probs

I gave him a spool mount for the trans, he said it would work......So, I will check in with him later today. He did stoip by and show me a pic, and the instructions look like the biscuit looks like it is suppoosed to lay sideways....to me, it seems strange to lay it on the horizontil, and stress it that way, but heck, I dont know.LOL
Will update you guys as I know more, and pass on info to him.....will go over next weekend and help him again if its not done.
Andrew/Kidd