kelsey hayes brake swap need info

Do the brake change before you paint under the hood. Got my 69 Dart back from paint shop (Just under hood, interior and trunk) and started brake change. Found rust under the upper A frames. Welding will ruin the paint in engine compartment. This is a very common place to find rust and should be addressed as it is structural in nature. The inner mounts for the A frames rust free from the frame rails.
Kelsey-Hayes calipers are $142 each at OReilly"s.