Master cylinder?? Issue.

i own 2 Mopars a 72 Duster and a 69 Roadrunner. My question pertains to the B body. 2 years ago I did a disc brake conversion on it. This included all new components to include the master cylinder a dual compartment 15/16 bore.

Today I went for a drive and noticed the car did not coast like it did the last time I drove it a couple months ago. I immediately cane back home and found that I could barely turn one of the front wheels and could not turn the other.

I broke the line loose on the master cylinder going to the front brakes and the wheel was free. I checked the pedal pushrod adjustment. And also pushed the pedal down and disconnected the push rod from the pedal and the same thing. It will only free when the line is broken loose.

I had another new master cyl on the shelf from another project so I bench bled and installed it with the same results.

Somehow in the process of the conversion the lines were reversed at the master cylinder. Front pot small reservoir is feeding the front disc. Large rear pot (at firewall) feeding the rear drums. I know this is wrong but I would have thought I’d noticed extremely hot front brakes over the last couple of years if there was a residual valve issue etc due to it plumbed incorrectly?

Any ideas? Thanks as always