I went with the strange front discs on my 68 mustang coupe bracket car. It took off about 42-44 lbs. The rears are 11" drums. The only 3 issues I had were 1) the cotter pin would not go through the spindle, 2) it moved the wheel out about 1/4", 3) the studs were a little short for the weld pro stars. I thinned the nut down on a lathe (about 1/32"- 1/16", don't exactly remember). You can't do anything about the movement of the wheel outward, but it didn't affect anything. The studs went all the way though the wheel, but it looked like it had too much depth on the lug nut. I bought a shorter head lug nut and it looked a little better. Also went with the strange master cylinder for disc/drum application. With the bias set more to the rears ( strange recommendation) the system works very well. Should have done it years ago, especially running at island drag way with the short shutdown. Also I can still hold the car on the starting line at 4500 on the convertor (5000) in real good air. Strange was very helpful with any questions I had ( and I had a bunch-lol).
Feel free to pm me if you have more questions as we are running the same body and I have been running mine since the 70's.