Update on my brakes. After getting the crap scared out of me with some idiot pulling out in front of me doing 65, I opted to upgrade even if it meant new rims. I bought Inline Tubes kit based on the 69 Firebird. They went in perfectly other than I had to grind off a small amount on the bracket (no structural impact), so I was able to keep my JC Rally wheels. OMG what a difference, it brakes like a new car. My only regret was not doing this sooner.