Picked up my first 67 and I have some questions

[budman k20]

Hi everyone my name is Bud and I'm a truckaholic. They say the first step is to admit you have a problem! I now own 4.75 of these trucks. I picked up a clean 67 LWB custom yesterday that will be the primary parts donor for my SWB project. My plan is to use a complete 72 front suspension for the PS and disk brakes. I also want to use a 72 rear for the 5 bolt axle flanges. The 67 has a 3.73 posi rear so my question is can I use the posi carrier out of the 67 in the 72 rear? I did search first!