The only reason to use the MII setup is to gain enough room for the 427SOHC, or if you can't find one in your salvage yard (LOL) one of them there newfangled MOD motors.
My TCP rack and pinion was a bolt-in:
http://www.edbert.net/randp.htm
My TCP rack and pinion was a bolt-in:
http://www.edbert.net/randp.htm