I had a small block Ford (1970 302) jump time at about 120,000 miles. Loose chain. Worn gears, and it jumped a tooth.
Started the Ford one morning. Died. Refused to start again. Cranked OK.
Checked fuel at the carb, yep, spark, yep. Checked ignition timing. Off by nearly 20 degrees. Which was about one tooth on the timing gear. Replaced the timing set, started right up.
Not as much experience with the modern Chevy engines, but this was the days of nylon covered gears, and they sure didn’t last long before a failure like this. Everybody raves about timing chains, but I’ve done quite a few timing chains.