So a few things. Cragar wheels are always lug centric. They are a “universal” design and don’t try to center on the hub.
Phord hubs are significantly smaller than Mopar even the small bolt pattern.
Factory Kelsey Hayes brakes had the caliper mounted to the rear on A bodies and front on the Phords. SSBC wants you to put the caliper to the front like the Phord. That needs the hard line to be moved to the front of the suspension. For Mopars this is wrong. Mount the caliper on the rear of the spindle and brake line issues go away. Also you do not want to route the brake line through the suspension. This necessitates that the calipers are swapped right to left so the bleeder is pointed up.
The phord disc system uses the same brake line as the Mopar drum if I recall correctly.
Sadly the only rotor that works on your set up is the SSBC rotor. They custom machine them in house to fit. (Wheel bearing locations are changed)
You can buy replacements from summit. But trying to go through SSBC direct is difficult.
Forgive me if I sound a bit short. I’m trying to put a number of thoughts out to help.