A-Arms question - Drum vs disc

[CPNE]

I need a definative answer before I start on this disc brake conversion.

What I have:

1. 67 3/4 ton 2wd rolling chassis - stock
2. 72 3/4 ton 2wd disc spindles rotors, calipers, etc - stock
3. 72 3/4 ton 2wd center drag link - stock

What I intend to purchase:

1. 72 3/4 ton 2wd inner/outer tie rods and adjusting sleeve
2. 72 3/4 ton 2wd upper and lower ball joints

My question is:

Can I simply remove the stock drum spindles and ball joints and replace with the above? Or will I have an issue trying to get the disc ball joints into the stock drum a-arms?

I am aware that the brake lines route differently and the lower a-arm will need a bracket welded to it for the caliper hoses. Other than that is this a slam dunk?

Thanks