i did this conversion a few years ago. you can use the power steering intermediate shaft, it is too long and will need cut down. what i did was i bought a u-joint from speedway motors out of lincoln, ne, cut the shaft down, and welded the u-joint on. works well and there is plenty of clearance for the headers, assuming you have a 302 car. i don't remember the spline count, but one end is 3/4" smooth bore, and i had to turn the shaft down to fit. i will try to get a picture up of it either sometime later tonight or tomorrow morning so you can see what i am talking about.