Repair or replace leaky evaporator?

In 1984 my 1974 Satellite Sebring evaporator started leaking. Removed and repaired by a local shop. Started leaking again in 1987 and had to top off R12 every year till traded car in 1992.

On my 1974 Dart Sport re-installed A/C with Ebay aftermarket evaporator and is ok after 2 years. See my post on A/C re-install.