Looks like you have it plumbed wrong. A Ford M/C has the front bowl to the rear brakes, and the larger rear bowl, to the front brakes.

My initial response was that you have a sticking caliper piston.  and the statement about the back of the rotor made it sure for me.  What calipers do you have.  K-H's, and other fixed caliper brakes, can easily stick when they get a little rusty.  I'm not sure about single piston calipers.  That sliding member may be sticking.  Check it out.

Need to know exact front brake system you have 

On floating calipers such as the original 68-73 Mustang disc brakes, a stuck caliper piston will result in excessive wear on the inner rotor surface, with minimal or no wear on the outer rotor surface.  A stuck caliper mounting bracket slide will result in excessive rotor wear on the outer rotor surface with little or no wear on the inner rotor surface.

I assume you have all brand new hoses, too, so a collapsed hose can be eliminated from possible defects.

Loose wheel bearing can cause excessive caliper travel making the opposite side grab first.

Loose suspension components can cause the car to dart when brakes applied.  Bad upper control arm bushings, strut rod bushings, tie rods, maybe even idler arm.

A bad tire can also cause pull. Tried swapping rears to front?

Just a note, I rebuilt my one sticking caliper, not much to it, couldn't have been easier.  I found everything internal to be in good shape (no pitting, or rust, on piston or the cylinder it fits into).  Changed the 'quad-ring' on the piston, put it back together and it works fine.  I mentioned this to my friend who owns a service station, he stated that the quad-ring is usually the issue.

Interesting. I bought new calipers and hoses. I will report back on the outcome. Thanks