LOng ago, I bought one of the Piranna kits, which used a slotted disc in place of the points and cap in the distributer. It was absolute magic after all the unreliabity I had suffered over the years from points, servicing them, adjusting them and retiming them. It became set and forget.
I moved that system on to every car I subsequently purchased, I think the last one being a Celica. Every car had a different distributor cam lobe and some were 4 some 6, so I became quite adept at fashioning the disks and the slots accurately.
I still have that Piranna unit on a shelf in my garage I think.