Nice looking car! What you described in your first post is some sort of movement and it did not sound like U-joints to me. I have had similar things happen to me before three times that I can remember. The first time it was a ball joint getting ready to let loose. The second time it was a A-arm bushing that was so worn there was more than an inch of extra movement. The third time it was the sub-frame bushings and the frame moved back and forth about an inch. This last problem sounds the most likely because when your subframe moves your steering column is one of the things holding it in place and you will feel it. U-joint usually shake and rattle your car and you feel it in the floor not the column. U-joints just get looser when the car warms up and the noise would get worse, not better. When you asked for help we felt like it was our("we" and "our" meaning anyone who takes the time to make a post just to help you) responsibility to help you make your car safe. Jim