TAJoe, your a lucky man to own a 73 TA, my favorites are early second generation Firebirds 70 - 73. I purchased a 1973 TA new and regret selling it. I also owned a 1975 TA, converted the stock 2:56 gear to a 3:08 rear disk differential from a 1980 Indy Pace car that burned to the ground, in 1980. I was happy to move up to a 3:08, but the rear disks didn’t make much difference in braking ability. But the four wheel disks look a lot nicer. My current ride a 1980 TA has the original 2:41, one of these days I will change it to a 3:08 or 3:23.
Anyway great seeing your progress!