I appreciate all the helpful input. I am just getting started with this challenger and it's the first I've owned. I had a 72 Dart and a 76 valiant/6 in high school. This one is getting the 440/727 combo, with a disc brake 9" that I originally bought for the Mustang. The man that sold me the car gave me a 440 w/906 ? heads, and a big block 727. He has a bunch of them and he thru it in. He and his brother dismantled a bunch of mopars about 20 years ago, and then did nothing with the parts. Now it's all in a building just south of Downtown Dallas, where it's been for 20 years. It means almost nothing to these guys as they just consider them old parts and old cars. But they just won't cooperate very well about trying to buy it all. Anyway, I'm rambling again. I am putting the later, bigger brakes. someone gave me the Disc-o-Tech article. It has been very helpful. Thanks Again, Suburbob