OK, I finally had a chance to work on the car (Just moved to Rhode Island). I spoke with Summit racing, where I purchased the Cragars, and they will take them back. I bought a set of American Racing TTIIs, 17x8s up front and 17x9.5s in the rear, with 235/45/17, and 255/45/17s. After replacing the tires and wheels; no more vibration. Until I actually did it, I had a very hard time believing it could be the wheels/tires since I swapped the rears to the front, and still had the issue. I was running the Cragar SS unilugs, and Firestone Indy 500s. The tires were from 2 different stores, and 2 different sizes. I must say from my experience, I would tell anyone to stay away from the Cragar unilugs, and if you are running them... buy a new set of wheels, and get rid of the Cragars. My car drives like a completely different car. It handles like a dream, and I'm not afraid of pushing it like I was with the other wheels. I know that the 17s, and lower profile tires have added to the handling, but man what a difference!!! Thanks to all who provided advice!