I finally got the master cylinder out from the frame rail. Someone in the past installed a plastic reservoir lid and it was so tight, it wouldn’t budge even with a 3/4’ break over and 1-1/8’ 6 point socket. Soaked for 48 hrs. In Ed’s Red. Had to almost melt with torch while trying with said wrench and Channel lock pliers, finally got it to move. NAPA has repair kit to rebuild, so that’s next. Love these old girls.