Right. Been having a few issues with backfiring through the carb, with flame. Not all the time, not every start, but enough to scare me at times.
More info. Pretty much always has a hard time starting when, and only when, hot. Basically, hold loud pedal to floor and crank.

Just checked firing order.
Threw a timing light on it the weekend. Was at 20 BTDC, retimed to 16 BTDC (next start just about set the car on fire).
What's next on the list?