225 Slant Six Distributor Question

I was doing points type cars so often I could set the gap by eye, and check it with a Dwell meter and be spot on.
Replace points and condencer as a set, and adding an extra earth wire to the body of the dizzy helps too.
Also checking the little earth braid for the points plate is inperitive.....as are checking the Vac advance and mechanical advance aren't sticking or siezed.