Don't just paint over the black paint, remove it all down to the metal, including the entire firewall, and check for rust. Rust is Enemy Number One, go after it when you a rare opprotunity like this.
Test all front suspension components for wear. Front end repairs need to be done at some point for all king pin style systems. Might as well replace these parts with no engine in the way.
Starting now, monitor your motor oil consumption very closely. Just before pulling the engine, perform a compression test and leak down test. If you have much oil consumption and the tests show engine wear, then after pulling the engine remove the bottom end cover and check the main bearings for wear. Determine if engine rebuild is necessary.
Replace all firewall rubber grommets and firewall insulation pad.
Recondition VIN plate, if on firewall (later cars had it on door jamb).
Ensure VIN on right subframe member matches VIN on plate and title.
Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both tops
1994 E420