This is the "first" time I took it apart, back in 2000.  I put in a Chevy smallblock, 700R-4 tranny, Curry Ford 9in rear, and 4 wheel disc. While I had it apart, I re-did the whole underside. I stripped it down to metal, sprayed 2 coats of Corroless, the spayed 2 coats of Nason Gloss Black Urethane, then put on 2 good coats of rubberized undercoat.

This was the underside before I started.

Sprayed with Eastwood Corroless (now Rust Encapsulator).

Undercoated.

Finished. I made all new brakelines out of stainless steel.