Instead of using dwell to set the points gap, if you set the gap to the narrow end of the adjustment range (.012") you'll get the strongest spark. The coil charges when the points are closed, and a narrow gap allows longer charging. That, plus a solid core coil wire, correct resistance in the rotor, plug wires, and plugs, and a plug gap on the narrow side, will give the fastest cold starts (along with correctly functioning carbs, of course).

Once you have it dialed in, starting nicely cold, taking throttle, and running correctly, you can go back and widen the plug gaps in increments, testing for a few days between each change, and see how it starts cold with a wider gap. A wider gap gives better performance and fuel economy, so you gap out the plugs, until you reach that point where it still starts good cold, and more gap makes it crank longer when cold.

__________________