I put 122 discs on my 544, I don't think 444's are any different.

Basically you just need parts from a donor 122, all the way down to a bare spindle. The rotor,/hub, the caliper, the dust shield (I guess that's optional), and the caliper mounting bracket.

On the PV, strip it down to the bare spindle as well. Take off the drum, the hub, and the drum brake back plate.

Then set about moving the shock from behind the front suspension arms to the front. This was the most difficult part of my swap, because it involves large stuck bolts that haven't budged in 40 years and really had no plans on ever budging again. But the shock mount bolts just bolt through the arms, you remove them and reinstall them facing forward. After, of course, taking the bottom one and cutting/rewelding it at a slight angle to give the steering some clearance at full lock. A modest task.

Then put the caliper mounting bracket up to the PV's spindle. You'll see that 3 of the 4 holes are in the wrong spot. Bolt on with the one good bolt hole and mark the other 3, and drill. Drill the dust shild as well if you plan on using it. I did, and had to trim the brake line mounting tab because it wanted to occupy the same bit of space as the upper part of the kingpin carrier.

Bolt on the caliper mount with proper hardware (good grade bolts with threadlocker). Then put on the hub/rotor (goes right on in the normal manner). Then the caliper and the pads.

Then there is the issue of the brake line. Initially on mine I just bolted the stock PV flex line right onto the caliper (loosened it at the body where the hard line attaches so it could rotate). This worked fairly well, but eventually I noticed that it could get a little tight when the swaybar was pushed up and the car was at full lock. So I engineered something a little better using a standard flex line with two female ends from the parts store (12" long) and a short hard line from the caliper to the brake line mount on the dust shield. I just got short lines from the parts store and cut and reflared them to the proper length.

After all that you take it for a drive, and you won't notice much of anything different. They aren't stronger. If anything they are a little weaker. You dont' have to adjust them nearly as often (the rears wear more slowly) which is nice. But if you do several hard stops in very quick succession, you'll notice that they don't start to fade like the drums do.
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'63 PV544 rat rod, '93 Classic #1141 245 +t