1973 318 - daily driver for years - now won’t start

The only time I ever lost a factory timing chain like the gear going bad, was this one time in a 69 ford with a 302. We exited the 99 near Earlimart to get gas, pulled in and parked... damn thing would not fire back up. I started in with the diagnostic with about no tools ... after finding no spark... I pulled the cap, my friend cranked it and the rotor never moved.... we ended up paying 100.00 bucks to an old mechanic at a hole in the wall shop about 2 blocks away to fix it. Turned out my friend had a timing set in the trunk, something he knew needed changed believe it or not...anyhow we pushed it over and it took him about 2 hrs.. and we were back on the road.