Won’t start

If the ignition system wiring is intact and the plugs wires were not disturbed, and you did not move the distributor at all, then you ignition timing is not a prime suspect.

Easy to check the spark: Take the central spark wire from the distributor cap and place it 1/4" from metal and crank; you should see a steady stream of good sparks to the metal. You can then put that back and take one spark wire from a plug and do the same thing and see a good spark every 2 rotations.

Try this: Dump 1/2 of a bottle cap of fresh fuel down the carb throat and see if it will fire at all. It should sputter a few seconds if the spark is OK.

Take the sight plug out of the side of the carbs bowls and see if the fuel is up to the bottom of the holes. (Or look at the viewing port for fuel level if it is a newer carb with those.)

If there is fuel, then pump the gas 2-3 times, and then release the throttle, and see if it will start.

Is your fuel all fresh in the tank? If it is several months old, take it all out of the tank and flush the lines and start over with fresh. Modern fuel does not last worth a darn....