Do they fit?

[67chevy_hotrod]

My longhorns pesky eaton rearend is leaking everywhere. even after I replaced the pinion seal. I figure it needs to be rebuilt, but they cost so much to rebuild I am thinking about a 14bolt ff with disc breaks already on it, I found this on Craigslist.. It comes with the front crossmember of the truck with disc also. All comes from a 78 1 ton. Will I be able to use the front brake parts? To swap my truck to disc? Also will the 14boltff just bolt in or are the spring perches different? I am replacing the master cylinder so I can get a prop. Valve incorporated in the system no sweat.