Brake drag. Need help.

To make a long story short, my front discs are dragging.

Long story is I have a 1973 scamp with Doctor diff front brake kit stage 1. New master cylinder and 1 piece proportioning valve from Doctor diff. At the track my car does not seem to be making the times that it should be. Certainly there are other factors but brake drag was brought up as a possible factor. Rebuilt rear drums. 512 ci RB motor. There is a line lock in place that appears to be functioning properly.

Other signs of brake drag are that after a 30 minute drive around town. Slowly. The front brake rotors are scalding hot. Sizzling if water touches them during a wash. I thought that it was the headers creating the heat,,, maybe not all of it. When the car is on jack stands, you can spin the tire with force but it stops immediately. The brake master cylinder had pressure that when I removed the cap to check levels, it popped . There was also fluid leaking out as though it was boiling. maybe not and I am imagining it but leaking nonetheless. The car does not coast very long in neutral. Finally, the rotors are super shiny, polished I would say.

Since everything is new, I did not know where to start. They rotors were tight from the beginning in that you could not turn the wheel freely from the get go. I was hoping that they would loosen up a bit.

My first checks to start today. Get the car up on stands.
1. open bleeders to check for residual pressure
2. put a dial gauge on the rotor to check for runout
3. loosen the caliper, press the brake pad all the way in, measure the opening and measure the rotor thickness. Maybe they are just too tight of tolerance and I need to turn the rotors down, say .005 in. each side.
4. While the calipers are off, I will check bearing tightness.
5. While the calipers are pressed in, put them back on without applying brake pressure and see if the wheels turn freely.
6. That should get me started, but I must be missing something. I will start this after church in a couple hours.

Please advise me if I am off track or missing something or any other information I can use. Fixing it will also need some advise and much of that depends on the diagnosis.

Thanks for the help in advance.